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.*;

class Main{

  public static void main(String args[]){

    Scanner s=new Scanner(System.in);
    String str=s.next();
	char[] c=str.toCharArray();
    if(Character.isUpperCase(c[0])) System.out.println("A");
    else System.out.println("a");

  }  
}