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

  }
}