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.* ;
import java.util.Map.Entry;
public class Main {
	public static void main(String[] args) {
		Scanner S = new Scanner( System.in ) ;
		char ch = S.nextLine().charAt(0)  ;
		if( Character.isUpperCase(ch) ) System.out.println( 'A' ) ;
		else System.out.println( 'a' ) ;
	}
}