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 c = sc.next().charAt(0); 

if(c>='a' && c<='z') 
{
System.out.println("a");
}
else 
{
System.out.println("A");
}
}
}
