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

console.log('Hello !', ' How old are you ? ')
process.stdin.on('data', (number) => {
    if (number <= 99 && number >= 0) {
        console.log('You are born in', 2019 - number)
    } else {
        console.log('the value must be less than 99')
    }
    process.exit()
})