Petya once wrote a sad love song and shared it to Vasya. The song is a string consisting of lowercase English letters. Vasya made up q questions about this song. Each question is about a subsegment of the song starting from the l-th letter to the r-th letter. Vasya considers a substring made up from characters on this segment and repeats each letter in the subsegment k times, where k is the index of the corresponding letter in the alphabet. For example, if the question is about the substring "abbcb", then Vasya repeats letter 'a' once, each of the letters 'b' twice, letter 'c" three times, so that the resulting string is "abbbbcccbb", its length is 10. Vasya is interested about the length of the resulting string.

Help Petya find the length of each string obtained by Vasya.

Input

The first line contains two integers n and q (1≤ n≤ 100 000, 1≤ q ≤ 100 000) — the length of the song and the number of questions. 

The second line contains one string s — the song, consisting of n lowercase letters of English letters.

Vasya's questions are contained in the next q lines. Each line contains two integers l and r (1 ≤ l ≤ r ≤ n) — the bounds of the question.

Output

Print q lines: for each question print the length of the string obtained by Vasya.

Examples

Input


7 3
abacaba
1 3
2 5
1 7


Output


4
7
11


Input


7 4
abbabaa
1 3
5 7
6 6
2 4


Output


5
4
1
5


Input


13 7
sonoshikumiwo
1 5
2 10
7 7
1 13
4 8
2 5
3 9


Output


82
125
9
191
62
63
97

Note

In the first example Vasya is interested in three questions. In the first question Vasya considers the substring "aba", that transforms to "abba", so the answer is equal to 4. In the second question Vasya considers "baca", that transforms to "bbaccca", so the answer is 7. In the third question Vasya considers the string "abacaba",that transforms to "abbacccabba" of length 11.
import java.util.*;

import java.io.*;

public class cf {
	static Reader sc = new Reader();
	static PrintWriter out = new PrintWriter(System.out);

	static int mod = (int) 1e9 + 7;

	public static void main(String[] args) {
		int n = sc.ni(), q = sc.ni();
		char[] s = sc.next().toCharArray();
		int[][] arr = new int[n][26];
		int[] f = new int[26];
		for (int i = 0; i < n; i++) {
			f[s[i] - 'a']++;
			arr[i] = f.clone();
		}
		while (q-- > 0) {
			int l = sc.ni() - 1, r = sc.ni() - 1;
			int[] curr = arr[r].clone();
			if (l > 0) {
				for (int i = 0; i < 26; i++) {
					curr[i] -= arr[l - 1][i];
				}
			}
			long res = 0;
			for (int i = 0; i < 26; i++) {
				res += (curr[i] * (i + 1));
			}
			out.println(res);
		}

		out.close();
	}

	public static long pow(long a, long b, long m) {
		if (b == 0) {
			return 1;
		}
		if (b % 2 == 0) {
			return pow((a * a) % m, b / 2, m) % m;
		} else {
			return (a * pow((a * a) % m, b / 2, m)) % m;
		}
	}

	// snippets

	static class Pair implements Comparable<Pair> {
		int x;
		int y;

		Pair(int x, int y) {
			this.x = x;
			this.y = y;

		}

		@Override
		public int compareTo(Pair o) {
			if (this.x > o.x)
				return 1;
			else if (this.x < o.x)
				return -1;
			else {
				if (this.y > o.y)
					return 1;
				else if (this.y < o.y)
					return -1;
				else
					return 0;
			}
		}

		public int hashCode() {
			int ans = 1;
			ans = x * 31 + y * 13;
			return ans;
		}

		@Override
		public boolean equals(Object o) {
			if (this == o) {
				return true;
			}
			if (o == null) {
				return false;
			}
			if (this.getClass() != o.getClass()) {
				return false;
			}
			Pair other = (Pair) o;
			if (this.x == other.x && this.y == other.y) {
				return true;
			}
			if (this.x == other.y && this.y == other.x) {
				return true;
			}
			return false;
		}

	}

	static void add_map(HashMap<Integer, Integer> map, int v) {
		if (!map.containsKey(v)) {
			map.put(v, 1);
		} else {
			map.put(v, map.get(v) + 1);
		}
	}

	static void remove_map(HashMap<Integer, Integer> map, int v) {
		if (map.containsKey(v)) {
			map.put(v, map.get(v) - 1);
			if (map.get(v) == 0)
				map.remove(v);
		}
	}

	static int gcd(int a, int b) {
		if (b == 0)
			return a;
		return gcd(b, a % b);
	}

	static long gcd(long a, long b) {
		if (b == 0)
			return a;
		return gcd(b, a % b);
	}

	static void sort(int[] arr) {
		// shuffle
		Random rand = new Random();
		for (int i = 0; i < arr.length; i++) {
			int j = rand.nextInt(i + 1);
			int tmp = arr[i];
			arr[i] = arr[j];
			arr[j] = tmp;
		}
		Arrays.sort(arr);
	}

	static void sort(long[] arr) {
		// shuffle
		Random rand = new Random();
		for (int i = 0; i < arr.length; i++) {
			int j = rand.nextInt(i + 1);
			long tmp = arr[i];
			arr[i] = arr[j];
			arr[j] = tmp;
		}
		Arrays.sort(arr);
	}

	static boolean isPrime(int n) {
		if (n <= 1)
			return false;
		if (n <= 3)
			return true;
		if (n % 2 == 0 || n % 3 == 0)
			return false;
		double sq = Math.sqrt(n);

		for (int i = 5; i <= sq; i = i + 6)
			if (n % i == 0 || n % (i + 2) == 0)
				return false;
		return true;
	}

	static boolean isPrime(long n) {
		if (n <= 1)
			return false;
		if (n <= 3)
			return true;
		if (n % 2 == 0 || n % 3 == 0)
			return false;
		double sq = Math.sqrt(n);

		for (int i = 5; i <= sq; i = i + 6)
			if (n % i == 0 || n % (i + 2) == 0)
				return false;
		return true;
	}

	static void print_arr(int A[]) {
		for (int i : A) {
			System.out.print(i + " ");
		}
		System.out.println();
	}

	static void print_arr(long A[]) {
		for (long i : A) {
			System.out.print(i + " ");
		}
		System.out.println();
	}

	static int min(int a, int b) {
		return Math.min(a, b);
	}

	static int min(int a, int b, int c) {
		return Math.min(a, Math.min(b, c));
	}

	static int min(int a, int b, int c, int d) {
		return Math.min(a, Math.min(b, Math.min(c, d)));
	}

	static int max(int a, int b) {
		return Math.max(a, b);
	}

	static int max(int a, int b, int c) {
		return Math.max(a, Math.max(b, c));
	}

	static int max(int a, int b, int c, int d) {
		return Math.max(a, Math.max(b, Math.max(c, d)));
	}

	static long min(long a, long b) {
		return Math.min(a, b);
	}

	static long min(long a, long b, long c) {
		return Math.min(a, Math.min(b, c));
	}

	static long min(long a, long b, long c, long d) {
		return Math.min(a, Math.min(b, Math.min(c, d)));
	}

	static long max(long a, long b) {
		return Math.max(a, b);
	}

	static long max(long a, long b, long c) {
		return Math.max(a, Math.max(b, c));
	}

	static long max(long a, long b, long c, long d) {
		return Math.max(a, Math.max(b, Math.max(c, d)));
	}

	static int max(int A[]) {
		int max = Integer.MIN_VALUE;
		for (int i = 0; i < A.length; i++) {
			max = Math.max(max, A[i]);
		}
		return max;
	}

	static int min(int A[]) {
		int min = Integer.MAX_VALUE;
		for (int i = 0; i < A.length; i++) {
			min = Math.min(min, A[i]);
		}
		return min;
	}

	static long max(long A[]) {
		long max = Long.MIN_VALUE;
		for (int i = 0; i < A.length; i++) {
			max = Math.max(max, A[i]);
		}
		return max;
	}

	static long min(long A[]) {
		long min = Long.MAX_VALUE;
		for (int i = 0; i < A.length; i++) {
			min = Math.min(min, A[i]);
		}
		return min;
	}

	static long sum(int A[]) {
		long sum = 0;
		for (int i : A) {
			sum += i;
		}
		return sum;
	}

	static long sum(long A[]) {
		long sum = 0;
		for (long i : A) {
			sum += i;
		}
		return sum;
	}

	static ArrayList<Integer> sieve(int n) {
		ArrayList<Integer> primes = new ArrayList<>();
		boolean[] isPrime = new boolean[n];
		Arrays.fill(isPrime, true);
		isPrime[0] = isPrime[1] = false;
		for (int i = 2; i * i <= n; i++) {
			if (isPrime[i]) {
				for (int j = i * i; j < n; j += i) {
					isPrime[j] = false;
				}
			}
		}
		for (int i = 2; i < n; i++) {
			if (isPrime[i])
				primes.add(i);
		}
		return primes;
	}

	static class Reader {
		BufferedReader br;
		StringTokenizer st;

		Reader() {
			br = new BufferedReader(new InputStreamReader(System.in));
			st = new StringTokenizer("");
		}

		Reader(File f) throws FileNotFoundException {
			br = new BufferedReader(new FileReader(f));
			st = new StringTokenizer("");
		}

		String next() {
			while (!st.hasMoreTokens())
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
				}
			return st.nextToken();
		}

		int ni() {
			return Integer.parseInt(next());
		}

		long nl() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		int[] nai(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = ni();
			return a;
		}

		long[] nal(int n) {
			long[] a = new long[n];
			for (int i = 0; i < n; i++)
				a[i] = nl();
			return a;
		}
	}

}