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

console.log('How old are you ?')
process.stdin.on('data', (number) => {
    if (isNaN(number)) {
        console.log(number + " isn't a number !");
    } else if (number > 99) {
        console.log("You can't choose a number above 99");
    } else {
        console.log('You were born on : ' + (2018 - number))
    }
    process.exit()
})