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();
 char c=s.charAt(0);
 
 if(c>='A' && c<='Z')
 c='A';
 
 else
 c='a';
 
 
      System.out.println(c);
    }
}