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

console.log('What\'s your age ? ')
process.stdin.on('data', (number) => {
  if ((number < 100)&&(number > 0)) {
	 let birthYear = 2019 - number;
  console.log('So , you should be born in ' + birthYear)
  process.exit()}
})