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.*;
import java.io.*;
class Main
{
    public static void main(String args[])throws IOException
    {
        char ch;
        ch=(char)System.in.read();
        if(Character.isUpperCase(ch))
            System.out.println("A");
        else
            System.out.println("a");
    }
}
