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 in = new java.util.Scanner(System.in);
		String X = in.nextLine();

		if((short)X.charAt(0) >= (short)'a') {
			System.out.println('a');
		}else {
			System.out.println('A');
		}
		in.close();
	}
}
