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

console.log('How old are you ?')
process.stdin.on('data', age => {
  if (isNaN(age) == false && age < 99) {
    console.log('You were born in ' + ('2019' - age))
    console.log('✔')
  } else console.log('Your age is incorrect...')
  console.log('✘')
  process.exit()
})