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

console.log('How old are you ?')
process.stdin.on('data', (age) => {
  if(isNaN(age)){
    return console.log(`${age} is not a number`)
  } else if (age > 99) {
    return console.log('your age can\'t be over 99')
  } else {
    console.log('You were born in ' + (2019 - age))
  }
  process.exit()
})