process.stdin.resume();
process.stdin.setEncoding('utf8');

console.log('What is your age  ? ');
process.stdin.on('data', (num) => {
    if (num <= 99 && num >0) {
        console.log(2019 - num);
        process.exit();
    } else {
        console.log('Not a number or to higth number');
        process.exit();
    };
});