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

console.log('How old are you ? ')
process.stdin.on('data', (age) => {
    date = 2019 - age;
    if (age < 99 && age > 0) {
        console.log(date)
    } else if (typeof age !== 'number') { console.log('age invalid') } else { console.log('what are you typing here ??') }

    process.exit()
})