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

console.log('How old are you? ')
process.stdin.on('data', (age) => {
    if (isNaN(age)) {
    console.log("that is not a number");
    }
    else if (age > 99) {
    console.log("You're too old for this game");
    } else {
    var year = (2019 - age);
    console.log("you were born in " + year);
    }
console.log("Goodbye!")
process.exit()
});