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

console.log('What\'s your age ? ')
process.stdin.on('data', (number) => {
  if (number > 0 && number < 99 && typeof number === "number") {
    console.log('You were born in ' + (2019 - number) + '.' )
  } else {
    console.log('wrong value')
  }
  process.exit()
 })