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
import java.util.Scanner;
class Main{
    public static void main(String []args){
          Scanner input=new Scanner(System.in);
      String temp=input.next();
      if(temp.toLowerCase().equals(temp)){
        System.out.print("a");
      }else{
        System.out.print("A");
      }
    }
}