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.*;

public class Main {
 static public void main(String args[]){
  Scanner sc=new Scanner(System.in);
   
  String str=sc.next();
  if(Character.isUpperCase(str.charAt(0)))
    System.out.print("A");
  else System.out.print("a");
 }
}
