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 sc = new Scanner(System.in);
  char ch = sc.next().charAt(0);
  int asciival = ch -'A';
  if(0 <= asciival && asciival <= 26)
    System.out.println("A");
  else
    System.out.println("a");
  }
}
