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: Runtime Error)

/**
 * main function
 * @param {string[]} input input from stdin
 */
function main(input) {
    const n = parseInt(input[0]);
    let seq = input[1].split(/ /g).map(c => parseInt(c)).slice(0, n);
    const q = parseInt(input[2]);
    const bcs = [...input.slice(3)].map(s => s.split(/ /g).map(n => parseInt(n)));

    bcs.forEach(([b, c], i) => {
        if (i >= q) {
            return;
        }
        seq = seq.map(n => n === b ? c : n);
        console.log(seq.reduce((a, b) => a + b));
    });
}

(() => {
    let input = '';
    process.stdin.resume();
    process.stdin.setEncoding('utf8');

    process.stdin.on('data', v => {
        input += v;
    });
    process.stdin.on('end', () => {
        main(input.split(/\r?\n/g).filter(l => l.length));
    });
})();