This morning Tolik has understood that while he was sleeping he had invented an incredible problem which will be a perfect fit for Codeforces! But, as a "Discuss tasks" project hasn't been born yet (in English, well), he decides to test a problem and asks his uncle.

After a long time thinking, Tolik's uncle hasn't any ideas on how to solve it. But, he doesn't want to tell Tolik about his inability to solve it, so he hasn't found anything better than asking you how to solve this task.

In this task you are given a cell field n ⋅ m, consisting of n rows and m columns, where point's coordinates (x, y) mean it is situated in the x-th row and y-th column, considering numeration from one (1 ≤ x ≤ n, 1 ≤ y ≤ m). Initially, you stand in the cell (1, 1). Every move you can jump from cell (x, y), which you stand in, by any non-zero vector (dx, dy), thus you will stand in the (x+dx, y+dy) cell. Obviously, you can't leave the field, but also there is one more important condition — you're not allowed to use one vector twice. Your task is to visit each cell of the field exactly once (the initial cell is considered as already visited).

Tolik's uncle is a very respectful person. Help him to solve this task!

Input

The first and only line contains two positive integers n, m (1 ≤ n ⋅ m ≤ 10^{6}) — the number of rows and columns of the field respectively.

Output

Print "-1" (without quotes) if it is impossible to visit every cell exactly once.

Else print n ⋅ m pairs of integers, i-th from them should contain two integers x_i, y_i (1 ≤ x_i ≤ n, 1 ≤ y_i ≤ m) — cells of the field in order of visiting, so that all of them are distinct and vectors of jumps between them are distinct too.

Notice that the first cell should have (1, 1) coordinates, according to the statement.

Examples

Input


2 3


Output


1 1
1 3
1 2
2 2
2 3
2 1

Input


1 1


Output


1 1

Note

The vectors from the first example in the order of making jumps are (0, 2), (0, -1), (1, 0), (0, 1), (0, -2).
#include <bits/stdc++.h>
#pragma gcc optimize("O3")
#pragma gcc target("sse4")
using namespace std;
mt19937 rng(2391);
template <typename A>
istream& operator>>(istream& fin, vector<A>& v) {
  for (auto it = v.begin(); it != v.end(); ++it) fin >> *it;
  return fin;
}
template <typename A, typename B>
istream& operator>>(istream& fin, pair<A, B>& p) {
  fin >> p.first >> p.second;
  return fin;
}
template <typename A, typename B>
pair<A, B> operator+(const pair<A, B>& a, const pair<A, B>& b) {
  return make_pair(a.first + b.first, a.second + b.second);
}
template <typename A, typename B>
pair<A, B> operator+=(pair<A, B>& a, const pair<A, B>& b) {
  a.first += b.first;
  a.second += b.second;
  return a;
}
template <typename A, typename B>
pair<A, B> operator-(const pair<A, B>& a, const pair<A, B>& b) {
  return make_pair(a.first - b.first, a.second - b.second);
}
template <typename A, typename B>
pair<A, B> operator-(const pair<A, B>& a) {
  return make_pair(-a.first, -a.second);
}
template <typename A, typename B>
pair<A, B>& operator++(pair<A, B>& a) {
  ++a.first;
  ++a.second;
  return a;
}
template <typename A, typename B>
pair<A, B>& operator--(pair<A, B>& a) {
  --a.first;
  --a.second;
  return a;
}
template <typename A>
vector<A>& operator++(vector<A>& a) {
  for (auto it = a.begin(); it != a.end(); ++it) ++*it;
  return a;
}
template <typename A>
vector<A>& operator--(vector<A>& a) {
  for (auto it = a.begin(); it != a.end(); ++it) --*it;
  return a;
}
template <typename A, typename B>
pair<A, B> operator++(pair<A, B>& a, int) {
  pair<A, B> b = a;
  ++a;
  return b;
}
template <typename A, typename B>
pair<A, B> operator--(pair<A, B>& a, int) {
  pair<A, B> b = a;
  --a;
  return b;
}
template <typename A>
vector<A>& operator++(vector<A>& a, int) {
  vector<A> b = a;
  ++a;
  return b;
}
template <typename A>
vector<A>& operator--(vector<A>& a, int) {
  vector<A> b = a;
  --a;
  return b;
}
vector<vector<int>> adjlist_from_edgelist(const vector<pair<int, int>>& e,
                                          const int& n) {
  vector<vector<int>> g(n);
  for (auto it = e.begin(); it != e.end(); ++it) {
    g[it->first].push_back(it->second);
    g[it->second].push_back(it->first);
  }
  return g;
}
template <typename A, typename B>
pair<A, B> operator-=(pair<A, B>& a, const pair<A, B>& b) {
  a.first -= b.first;
  a.second -= b.second;
  return a;
}
template <typename A>
A operator*(const pair<A, A>& p, const pair<A, A>& q) {
  return p.first * q.first + p.second * q.second;
}
template <typename A>
pair<A, A> operator*(const pair<A, A>& p, const A& q) {
  return make_pair(p.first * q, p.second * q);
}
template <typename A>
A operator%(const pair<A, A>& p, const pair<A, A>& q) {
  return p.first * q.second - p.second * q.first;
}
template <typename A>
A sq_len(const pair<A, A>& p) {
  return p * p;
}
template <typename A>
A sq_dist(const pair<A, A>& p, const pair<A, A>& q) {
  return sq_len(p - q);
}
template <typename A>
double len(const pair<A, A>& p) {
  return sqrt(sq_len(p));
}
template <typename A>
double dist(const pair<A, A>& p, const pair<A, A>& q) {
  return len(p - q);
}
template <typename A>
bool is_rhombus(const pair<A, A>& a, const pair<A, A>& b, const pair<A, A>& c,
                const pair<A, A>& d) {
  A x = sq_dist(a, b);
  A y = sq_dist(b, c);
  A z = sq_dist(c, d);
  A t = sq_dist(d, a);
  return ((x == y) && (y == z) && (z == t));
}
template <typename A>
bool is_rectangle(const pair<A, A>& a, const pair<A, A>& b, const pair<A, A>& c,
                  const pair<A, A>& d) {
  pair<A, A> x = a - b, y = b - c, z = c - d, t = d - a;
  return ((x * y == 0) && (y * z == 0) && (z * t == 0) && (t * x == 0));
}
template <typename A>
bool are_parallel(const pair<A, A>& a, const pair<A, A>& b) {
  return (a % b == 0);
}
template <typename A>
bool are_orthogonal(const pair<A, A>& a, const pair<A, A>& b) {
  return (a * b == 0);
}
template <typename A>
bool are_codirected(const pair<A, A>& a, const pair<A, A>& b) {
  return (are_parallel(a, b) && (a * b >= 0));
}
template <typename A>
bool is_parallelogram(const pair<A, A>& a, const pair<A, A>& b,
                      const pair<A, A>& c, const pair<A, A>& d) {
  return ((a - b) == (d - c));
}
template <typename A>
bool is_trapezoid(const pair<A, A>& a, const pair<A, A>& b, const pair<A, A>& c,
                  const pair<A, A>& d) {
  pair<A, A> x = a - b, z = d - c;
  return are_codirected(x, z);
}
template <typename A>
bool is_convex_polygon(const pair<A, A>& a, const pair<A, A>& b,
                       const pair<A, A>& c, const pair<A, A>& d) {
  pair<A, A> x = a - b, y = b - c, z = c - d, t = d - a;
  A p = x % y, q = y % z, r = z % t, s = t % x;
  return (((p >= 0) && (q >= 0) && (r >= 0) && (s >= 0)) ||
          ((p <= 0) && (q <= 0) && (r <= 0) && (s <= 0)));
}
template <typename A>
bool nprcs(const pair<A, A>& a, const pair<A, A>& c) {
  return ((a % c) >= 0);
}
template <typename A>
bool nprcs(const pair<A, A>& a, const pair<A, A>& b, const pair<A, A>& c) {
  return nprcs(a - b, a - c);
}
template <typename A>
bool npocs(const pair<A, A>& a, const pair<A, A>& c) {
  return ((a % c) <= 0);
}
template <typename A>
bool npocs(const pair<A, A>& a, const pair<A, A>& b, const pair<A, A>& c) {
  return npocs(a - b, a - c);
}
template <typename A>
bool prcs(const pair<A, A>& a, const pair<A, A>& c) {
  return ((a % c) > 0);
}
template <typename A>
bool prcs(const pair<A, A>& a, const pair<A, A>& b, const pair<A, A>& c) {
  return prcs(a - b, a - c);
}
template <typename A>
bool pocs(const pair<A, A>& a, const pair<A, A>& c) {
  return ((a % c) < 0);
}
template <typename A>
bool pocs(const pair<A, A>& a, const pair<A, A>& b, const pair<A, A>& c) {
  return pocs(a - b, a - c);
}
template <typename A>
bool different_sides(const pair<A, A>& a, const pair<A, A>& b,
                     const pair<A, A>& c, const pair<A, A>& d) {
  pair<A, A> x = b - a;
  A p = x % (c - b), q = x % (d - b);
  return (((p >= 0) && (q <= 0)) || ((p <= 0) && (q >= 0)));
}
template <typename A>
bool sharply_different_sides(const pair<A, A>& a, const pair<A, A>& b,
                             const pair<A, A>& c, const pair<A, A>& d) {
  pair<A, A> x = b - a;
  A p = x % (c - b), q = x % (d - b);
  return (((p > 0) && (q < 0)) || ((p < 0) && (q > 0)));
}
template <typename A>
pair<A, A> rot_90(const pair<A, A>& p) {
  return make_pair(-p.second, p.first);
}
template <typename A>
pair<A, A> rot_90(const pair<A, A>& p, const pair<A, A>& c) {
  return c + rot_90(p - c);
}
template <typename A>
bool intersecting_segments(const pair<A, A>& a, const pair<A, A>& b,
                           const pair<A, A>& c, const pair<A, A>& d) {
  return different_sides(a, b, c, d) && different_sides(c, d, a, b);
}
template <typename A>
bool sharply_intersecting_segments(const pair<A, A>& a, const pair<A, A>& b,
                                   const pair<A, A>& c, const pair<A, A>& d) {
  return sharply_different_sides(a, b, c, d) &&
         sharply_different_sides(c, d, a, b);
}
template <typename A>
pair<pair<A, A>, A> line_with_normal_vector_through_point(
    const pair<A, A>& normal, const pair<A, A>& point) {
  return make_pair(normal, -(normal * point));
}
template <typename A>
pair<pair<A, A>, A> serper(const pair<A, A>& a, const pair<A, A>& b) {
  pair<A, A> p = b - a;
  return make_pair(p + p, -(p * (a + b)));
}
pair<double, double> ints(const pair<double, double>& p, const double& a,
                          const pair<double, double>& q, const double& b) {
  double D = p % q;
  double E =
      pair<double, double>(-a, p.second) % pair<double, double>(-b, q.second);
  double F =
      pair<double, double>(p.first, -a) % pair<double, double>(q.first, -b);
  return pair<double, double>(E / D, F / D);
}
pair<double, double> circumcenter(const pair<double, double>& x,
                                  const pair<double, double>& y,
                                  const pair<double, double>& z) {
  auto p1 = serper(x, y), p2 = serper(x, z);
  return ints(p1.first, p1.second, p2.first, p2.second);
}
template <typename A>
pair<pair<A, A>, A> l_th_2(const pair<A, A>& p, const pair<A, A>& q) {
  return make_pair(make_pair(q.second - p.second, p.first - q.first), -p % q);
}
template <typename A>
vector<pair<double, double>> circle_intersection(const pair<pair<A, A>, A>& a,
                                                 const pair<pair<A, A>, A>& b) {
  pair<A, A> c = b.first - a.first;
  A rr1 = a.second * a.second, rr2 = b.second * b.second, cc = c * c,
    rrrr1 = rr1 * rr1, rrrr2 = rr2 * rr2, cccc = cc * cc,
    D = 2 * (rr1 * rr2 + rr2 * cc + cc * rr1) - (rrrr1 + rrrr2 + cccc);
  if (D >= 0) {
    double E = (((double)(rr1 - rr2)) / cc + 1) / 2;
    pair<double, double> baza =
        pair<double, double>(a.first.first, a.first.second) +
        pair<double, double>(c.first, c.second) * E;
    if (D) {
      double lll = sqrt((double)(D)) / (2 * cc);
      pair<A, A> cr = rot_90(c);
      pair<double, double> pmm =
          pair<double, double>(cr.first, cr.second) * lll;
      return {baza + pmm, baza - pmm};
    } else
      return vector<pair<double, double>>(1, baza);
  } else
    return vector<pair<double, double>>();
}
template <typename A, typename B>
pair<A, B> sopr(const pair<A, B>& p) {
  return make_pair(p.first, -p.second);
}
template <typename A>
bool on_segment(const pair<A, A>& a, const pair<A, A>& b, const pair<A, A>& c) {
  return are_codirected(b - a, c - b);
}
template <typename A>
pair<pair<A, A>, A> perpendicular(const pair<A, A>& line,
                                  const pair<A, A>& point) {
  return line_with_normal_vector_through_point(rot_90(line), point);
}
pair<double, double> projection(const pair<pair<double, double>, double>& line,
                                const pair<double, double>& point) {
  pair<pair<double, double>, double> temp = perpendicular(line.first, point);
  return ints(line.first, line.second, temp.first, temp.second);
}
pair<double, double> height(const pair<double, double>& a,
                            const pair<double, double>& b,
                            const pair<double, double>& c) {
  return projection(l_th_2(a, c), b);
}
pair<double, double> unitvector(const pair<double, double>& a) {
  return a * (1 / len(a));
}
template <typename T>
vector<int> z_function(const vector<T>& s) {
  int n = ((int)(s.size()));
  vector<int> z(n);
  int l = 0, r = 1;
  for (int i = 1; i < n; ++i) {
    z[i] = max(0, min(r - i, z[i - l]));
    while (i + z[i] < n && (s[i + z[i]] == s[z[i]])) ++z[i];
    if (r < i + z[i]) {
      l = i;
      r = i + z[i];
    }
  }
  return z;
}
pair<int, int> euc(const int& m, const int& n) {
  if (n == 0) return pair<int, int>((m >= 0) ? 1 : -1, 0);
  int t = m / n;
  pair<int, int> ans1 = euc(n, m - t * n);
  return pair<int, int>(ans1.second, ans1.first - ans1.second * t);
}
int prod(const int& a, const int& b, const int& M) {
  return ((long long)(a)) * b % M;
}
int sum(const int& a, const int& b, const int& M) {
  int c = a + b;
  return c >= M ? c - M : c;
}
int raz(const int& a, const int& b, const int& M) {
  int c = a - b;
  return c < 0 ? c + M : c;
}
long long prodll(const long long& a, const long long& b, const long long& M) {
  return a * b % M;
}
long long sumll(const long long& a, const long long& b, const long long& M) {
  long long c = a + b;
  return c >= M ? c - M : c;
}
long long razll(const long long& a, const long long& b, const long long& M) {
  long long c = a - b;
  return c < 0 ? c + M : c;
}
template <typename A>
bool angdis_cmp(const pair<A, A>& a, const pair<A, A>& b) {
  A p;
  if (p = a % b)
    return (p > 0);
  else
    return sq_len(a) < sq_len(b);
}
template <typename T>
int find_min_idx(const vector<T>& v) {
  int ans = 0, n = ((int)(v.size()));
  for (int i = 1; i < n; ++i)
    if (v[i] < v[ans]) ans = i;
  return ans;
}
template <typename T>
vector<int> convex_hull(vector<pair<T, T>>& a) {
  int n = ((int)(a.size()));
  if (n) {
    int mt = find_min_idx(a);
    pair<T, T> d = a[mt];
    for (int i = 0; i < n; ++i) a[i] -= d;
    vector<int> idx(n);
    for (int i = 0; i < n; ++i) idx[i] = i;
    sort(idx.begin(), idx.end(),
         [&](const int& l, const int& r) { return angdis_cmp(a[l], a[r]); });
    vector<int> h(1, idx.front());
    for (auto it = idx.begin() + 1; it != idx.end(); ++it) {
      auto temp = a.begin() + *it;
      if (((int)(h.size())) >= 2) {
        if (are_parallel(a[h.back()], *temp)) h.pop_back();
        while ((((int)(h.size())) >= 3) &&
               npocs(a[h[((int)(h.size())) - 2]], a[h.back()], *temp))
          h.pop_back();
      }
      h.push_back(*it);
    }
    for (int i = 0; i < n; ++i) a[i] += d;
    return h;
  } else
    return vector<int>();
}
pair<int, int> cool_gcd(const int& a, const int& b) {
  if (b) {
    int c = a / b;
    pair<int, int> ans1 = cool_gcd(b, a - b * c);
    return pair<long long, long long>(ans1.second,
                                      ans1.first - ans1.second * c);
  } else
    return pair<int, int>(1, 0);
}
pair<long long, long long> cool_gcdll(const long long& a, const long long& b) {
  if (b) {
    long long c = a / b;
    pair<long long, long long> ans1 = cool_gcdll(b, a - b * c);
    return pair<long long, long long>(ans1.second,
                                      ans1.first - ans1.second * c);
  } else
    return pair<long long, long long>(1ll, 0ll);
}
int gcd(int a, int b) {
  while (b) {
    a %= b;
    swap(a, b);
  }
  return a;
}
long long gcdll(long long a, long long b) {
  while (b) {
    a %= b;
    swap(a, b);
  }
  return a;
}
long long pr_p(const long long& a, const long long& b, const long long& p) {
  if (b < 1000000) return (a * b) % p;
  long long temp = pr_p(a, b >> 1ll, p);
  temp = sumll(temp, temp, p);
  if (b & 1ll)
    return sumll(temp, a, p);
  else
    return temp;
}
long long po_p(const long long& a, const long long& b, const long long& p) {
  if (b < 2) {
    if (b == 0)
      return 1;
    else
      return a;
  }
  long long temp = po_p(a, b >> 1ll, p);
  temp = pr_p(temp, temp, p);
  if (b & 1ll)
    return pr_p(temp, a, p);
  else
    return temp;
}
int pow_mod(const int& a, const int& b, const int& p) {
  if (b < 2) {
    if (b == 0)
      return 1;
    else
      return a;
  }
  int temp = pow_mod(a, b >> 1, p);
  temp = prod(temp, temp, p);
  if (b & 1)
    return prod(temp, a, p);
  else
    return temp;
}
long long pow_modll(const long long& a, const long long& b,
                    const long long& p) {
  if (b < 2) {
    if (b == 0)
      return 1;
    else
      return a;
  }
  long long temp = pow_modll(a, b >> 1ll, p);
  temp = prodll(temp, temp, p);
  if (b & 1ll)
    return prodll(temp, a, p);
  else
    return temp;
}
int inverse(int a, int n) {
  int c = cool_gcd(a, n).first;
  if (c < 0) c += n;
  return c;
}
long long inversell(long long a, long long n) {
  long long c = cool_gcdll(a, n).first;
  if (c < 0) c += n;
  return c;
}
template <typename A>
pair<int, int> equal_elements(const vector<A>& u, const vector<A>& v) {
  pair<int, int> ans(INT_MAX, INT_MAX);
  int m = ((int)(u.size())), n = ((int)(v.size()));
  vector<int> id_u(m);
  for (int i = 1; i < m; ++i) id_u[i] = i;
  vector<int> id_v(n);
  for (int i = 1; i < n; ++i) id_v[i] = i;
  sort(id_u.begin(), id_u.end(),
       [&](const int& x, const int& y) { return u[x] < u[y]; });
  sort(id_v.begin(), id_v.end(),
       [&](const int& x, const int& y) { return v[x] < v[y]; });
  int i = 0;
  int j = 0;
  while ((i < m) && (j < n)) {
    if (u[id_u[i]] < v[id_v[j]])
      ++i;
    else if (v[id_v[j]] < u[id_u[i]])
      ++j;
    else {
      ans = min(ans, pair<int, int>(id_v[j], id_u[i]));
      ++j;
    }
  }
  if (ans.first == INT_MAX)
    return pair<int, int>(-1, -1);
  else
    return pair<int, int>(ans.second, ans.first);
}
long long discr_log(long long a, long long b, long long n) {
  int k = ((int)(sqrt((long double)n)));
  long long a1 = inversell(a, n);
  int l = k + 20;
  long long a2 = po_p(a1, k, n);
  vector<long long> seq1(k), seq2(l);
  seq1.front() = 1;
  for (int i = 1; i < k; ++i) seq1[i] = pr_p(seq1[i - 1], a, n);
  seq2.front() = b;
  for (int i = 1; i < l; ++i) seq2[i] = pr_p(seq2[i - 1], a2, n);
  pair<long long, long long> e = equal_elements(seq1, seq2);
  if (e.first == -1)
    return -1;
  else
    return e.first + e.second * k;
}
long long common_discr_log(long long a, long long b, long long n) {
  const int C = 70;
  a %= n;
  b %= n;
  if (gcdll(n, a) != 1) {
    for (int i = 0; i < C; ++i) {
      if (po_p(a, i, n) == b) {
        return i;
      }
    }
    long long multp = po_p(a, C, n);
    long long g = gcdll(multp, n);
    if (b % g) {
      return -1;
    } else {
      b /= g;
      n /= g;
      multp /= g;
      long long pop_back = inversell(multp, n);
      b = pr_p(b, pop_back, n);
      long long ans = discr_log(a, b, n);
      if (ans == -1)
        return -1;
      else
        return ans + C;
    }
  } else
    return discr_log(a, b, n);
}
struct factorizator {
  const int N = 2000001;
  vector<int> pr;
  vector<int> md;
  vector<int> pw;
  vector<int> without_md;
  void init() {
    md.resize(N);
    pw.resize(N);
    pr.reserve(N);
    without_md.resize(N, 1);
    for (int i = 2; i < N; ++i) md[i] = i;
    for (int i = 2; i < N; ++i) {
      if (md[i] == i) pr.push_back(i);
      bool worth = true;
      for (int j = 0; worth && (j < ((int)(pr.size()))) && (pr[j] <= md[i]);
           ++j) {
        long long temp = ((long long)(pr[j])) * i;
        if (temp < N)
          md[((int)temp)] = pr[j];
        else
          worth = false;
      }
    }
    for (int i = 2; i < N; ++i) {
      int t = md[i], s = i / t;
      if (md[s] == t) {
        pw[i] = 1 + pw[s];
        without_md[i] = without_md[s];
      } else {
        pw[i] = 1;
        without_md[i] = s;
      }
    }
  }
  void known_factorization(int n, vector<pair<int, int>>& v) {
    while (n > 1) {
      v.emplace_back(md[n], pw[n]);
      n = without_md[n];
    }
  }
  vector<pair<int, int>> factorize(int n) {
    vector<pair<int, int>> ans;
    for (int i = 0;
         (i < ((int)(pr.size()))) && (pr[i] * ((long long)(pr[i])) <= n); ++i) {
      int t = n / pr[i];
      if (t * pr[i] == n) {
        ans.emplace_back(pr[i], 0);
        do {
          ++ans.back().second;
          n = t;
          t = n / pr[i];
        } while (t * pr[i] == n);
      }
      if (n < N) {
        known_factorization(n, ans);
        return ans;
      }
    }
    if (n > 1) ans.emplace_back(n, 1);
    return ans;
  }
  vector<pair<int, int>> merge(const vector<pair<int, int>>& p1,
                               const vector<pair<int, int>>& p2) {
    vector<pair<int, int>> ans;
    int m = ((int)(p1.size()));
    int n = ((int)(p2.size()));
    int i = 0;
    int j = 0;
    while ((i < m) || (j < n)) {
      if (i < m) {
        if (j < n) {
          if (p1[i].first < p2[j].first)
            ans.push_back(p1[i++]);
          else if (p1[i].first > p2[j].first)
            ans.push_back(p2[j++]);
          else {
            ans.emplace_back(p1[i].first, p1[i].second + p2[j].second);
            ++i;
            ++j;
          }
        } else
          ans.push_back(p1[i++]);
      } else
        ans.push_back(p2[j++]);
    }
  }
};
factorizator fac;
int phi(const vector<pair<int, int>>& v) {
  int ans = 1;
  for (int i = 0; i < ((int)(v.size())); ++i) {
    ans *= v[i].first - 1;
    for (int j = 1; j < v[i].second; ++j) ans *= v[i].first;
  }
  return ans;
}
int phi(const int& n) { return phi(fac.factorize(n)); }
bool check_primitive_root(const int& ph, const vector<int>& to_check,
                          const int& r, const int& n) {
  for (int i = 0; i < ((int)(to_check.size())); ++i)
    if (pow_mod(r, to_check[i], n) == 1) return false;
  return (pow_mod(r, ph, n) == 1);
}
int primitive_root(const int& n) {
  if (n < 3) return n - 1;
  int p = phi(n);
  vector<pair<int, int>> f = fac.factorize(p);
  vector<int> to_check(((int)(f.size())));
  for (int i = 0; i < ((int)(f.size())); ++i) to_check[i] = p / f[i].first;
  for (int i = 2; i < n; ++i)
    if (check_primitive_root(p, to_check, i, n)) return i;
  return -1;
}
int unite_mod(const int& a, const int& p, const int& b, const int& q) {
  pair<int, int> c = cool_gcd(p, q);
  int pr = p * q;
  int ans = ((a * c.second * q + b * c.first * p) % pr + pr) % pr;
  return ans;
}
long long unite_modll(const long long& a, const long long& p,
                      const long long& b, const long long& q) {
  pair<long long, long long> c = cool_gcdll(p, q);
  long long pr = p * q;
  long long ans = ((a * c.second * q + b * c.first * p) % pr + pr) % pr;
  return ans;
}
pair<int, int> power_v(int n, const int& p) {
  int ans = 0;
  while (n % p == 0) {
    n /= p;
    ++ans;
  }
  return pair<int, int>(ans, n);
}
int square_root_prime_modulo(int c, int n, const int& pr, const int& k) {
  c %= n;
  if (c) {
    pair<int, int> kek = power_v(c, pr);
    int l = kek.first;
    if (l & 1) return -1;
    if (l > 0) {
      int pwl = 1;
      for (int i = 0; i < l; ++i) pwl *= pr;
      n /= pwl;
      c /= pwl;
      int ans1 = square_root_prime_modulo(c, n, pr, k - l);
      if (ans1 == -1) return -1;
      for (int i = 0; i < (l >> 1); ++i) ans1 *= pr;
      return ans1;
    } else {
      int primitive;
      if (n & 1)
        primitive = primitive_root(n);
      else
        primitive = 5;
      int u = ((int)discr_log(primitive, c, n));
      if (u == -1) return -1;
      if (u & 1) return -1;
      return pow_mod(primitive, u >> 1, n);
    }
  } else
    return 0;
}
int square_root_modulo(const int& c, const int& n) {
  vector<pair<int, int>> f = fac.factorize(n);
  int a = 0, p = 1;
  for (int i = 0; i < ((int)(f.size())); ++i) {
    int q = 1;
    for (int j = 0; j < f[i].second; ++j) q *= f[i].first;
    int b = square_root_prime_modulo(c, q, f[i].first, f[i].second);
    if (b == -1) return -1;
    a = unite_mod(a, p, b, q);
    p *= q;
  }
  return a;
}
const int C = 4000000;
struct st {
  int* sum;
  int* lm;
  void init() {
    sum = new int[C];
    lm = new int[C];
    fill(sum, sum + C, 0);
    fill(lm, lm + C, 0);
  }
  void add(int v, int l, int r, int x, int val) {
    if (l == r) {
      sum[v] += val;
      lm[v] = max(0, sum[v]);
    } else {
      int m = (l + r) / 2;
      if (x <= m)
        add(2 * v + 1, l, m, x, val);
      else
        add(2 * v + 2, m + 1, r, x, val);
      sum[v] = sum[2 * v + 1] + sum[2 * v + 2];
      lm[v] = max(lm[2 * v + 2], sum[2 * v + 2] + lm[2 * v + 1]);
    }
  }
  int find_money(int v, int l, int r, int val) {
    if (lm[v] < val) return -1;
    if (val <= 0) return r + 1;
    if (l == r) return r;
    int m = (l + r) / 2;
    if (lm[2 * v + 2] >= val)
      return find_money(2 * v + 2, m + 1, r, val);
    else
      return find_money(2 * v + 1, l, m, val - sum[2 * v + 2]);
  }
};
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cerr.tie(0);
  int n, m;
  cin >> n >> m;
  vector<pair<int, int>> v(n * m);
  int t = 0;
  bool b = false;
  for (int i = 0; i < n; ++i) {
    if (b)
      for (int j = m - 1; j >= 0; --j) v[t++] = pair<int, int>(i, j);
    else
      for (int j = 0; j < m; ++j) v[t++] = pair<int, int>(i, j);
    if ((n & 1) || (i != n / 2 - 1)) b = !b;
  }
  int x = 0, y = n * m - 1;
  b = true;
  while (x <= y) {
    pair<int, int> p;
    if (b)
      p = v[x++];
    else
      p = v[y--];
    b = !b;
    cout << p.first + 1 << ' ' << p.second + 1 << '\n';
  }
  return 0;
}
