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;
import java.lang.*;
class Main{
      public static void main(String args[]){
	Scanner sc = new Scanner(System.in);
	String s = sc.next();
	if(Character.isLowerCase(s.charAt(0))){
	    System.out.println("a");
	}else{
	    System.out.println("A");
	}
	sc.close();
      }
}
