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 a=sc.next().charAt(0);
   int c=a;
    if(c>=65&&c<=90){
    
System.out.println("A");
    }else if(c>=97&&c<=122){
System.out.println("a");
    }
  }
}