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.*;
public class Main
{
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    char val = sc.nextLine().charAt(0);
	    if(Character.isUpperCase(val)){
	        System.out.println('A');
	    }else{
	        System.out.println('a');
	    }
	}
}