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

console.log('What\'s your age ? ')
process.stdin.on('data', (date) => {
  if(date < 0){
    console.log("Are you even alive?")
    process.exit()
  } else if (date > 99){
    console.log("You cannot be older than 99 years old! That's impossible!")
    process.exit()
  } else if (isNaN(date)){
    console.log("You need to enter a numeric value")
    process.exit()
  } else {
    console.log(`You were born in ${2019 - date}`)
    process.exit()
  }
})