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 o="";
        char x=sc.next().charAt(0);
        if((int)x>=97&&(int)x<=122)o="a";
        else o="A";
        
      System.out.println(o);
    }
    
}