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 JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

function main(input) {
  let args = input.split(/\n|\s/);
  const isUpperCase = c => {
  return /^[A-Z]+$/g.test(c)
}
  if (isUpperCase(args[0])) {
    console.log('A');
  } else {
    console.log('a');
  }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));