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 scan = new Scanner(System.in);
   String str = scan.nextLine();
   if(str == str.toUpperCase()) {
   	System.out.println('A');
   } else {
    System.out.println('a');
   }
 }
}