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

console.log('What\'s your age ? ')
process.stdin.on('data', (age) => {
  if(isNaN(age)==true)
  {
    console.log("This is not an age!")
  } else{
    if(age>99 || age==0)
    {
      console.log("Your age must be less than 99 and greater than 0")
    }
    else{
      console.log('You were born in ' + (2019 - age))
    }

  }

  process.exit()
})