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 s = sc.next();
    String ans = "a";
    if(s.matches("[A-Z]")) {
    	ans = "A";
    }
    
    System.out.println(ans);
  }
}
