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) {
        try (Scanner s = new Scanner(System.in)) {
            char c = s.next().charAt(0);
            System.out.println('A' <= c && c <= 'Z' ? 'A' : 'a');
        }
    }
}
