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 {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    String ans;
    ans = (S.toLowerCase().equals(S))? "a" : "A";
    System.out.println(ans);
  }
}