Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

B

Sample Output 1

A

B is uppercase, so we should print A.

Sample Input 2

a

Sample Output 2

a

a is lowercase, so we should print a.

Solution in PHP (7.4.4) (judge verdict: Wrong Answer)

<?php
$alphabet = trim(fgets(STDIN));
if(preg_match('/[A-Z]/', $alphabet)) {
    echo "A";
} else if(preg_match('/[a-z]/'.$alpabet)) {
    echo "a";
}