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.lang.*;
class Main
{
  public static void main(String args[])
  {
    Scanner sc=new Scanner(System.in);
    String s=sc.next();
    char ch=s.charAt(0);
    if(ch>='A' && ch<='Z')
      System.out.println("A");
    else
      System.out.println("a");
  }
}
