An uppercase or lowercase English letter \alpha will be given as input. If \alpha is uppercase, print `A`; if it is lowercase, print `a`.

Constraints

* \alpha is an uppercase (`A` - `Z`) or lowercase (`a` - `z`) English letter.

Input

Input is given from Standard Input in the following format:


α


Output

If \alpha is uppercase, print `A`; if it is lowercase, print `a`.

Examples

Input

B


Output

A


Input

a


Output

a
#include <bits/stdc++.h>
using namespace std;
typedef int64_t ll;

int main(){
  char x;
  cin>>x;
  cout<<(x-'a'<0?'A':'a')<<endl;
}
