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;

	public class Main{

		public static void main(String[] args){

			Scanner sc = new Scanner(System.in);
			String chara = sc.next();
			if(Character.isLowerCase( chara.charAt(0))){
				System.out.println("a");
			}else{
				System.out.println("A");
			}
			}
}
