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