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

console.log('What\'s your age ? ')
process.stdin.on('data', (text) => {
    const integer = parseInt(text, 10);
    if (integer < 0 || integer > 99){
        console.log("Nope !");
        process.exit();
    }
    else if (Number.isInteger(integer) === false){
        console.log('Nope !');
        process.exit();
    }
    else {
        console.log('You were born in ' + (2019 - integer))
        process.exit()
    }
})