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.Scanner;

public class Main {
  public static void main(String args[]) {
    Scanner scanner = new Scanner(System.in);
    char ch = scanner.next().charAt(0);
    if(ch >= 'a' && ch <= 'z')
      System.out.println('a');
    else
      System.out.println('A');
  }
}