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

console.log('How old are you ?')
process.stdin.on('data', (text) => {
  if (text < 0 || text > 99 ){
    console.log('Is not possible!');
    process.exit()
  }
  else if (isNaN(text)) {
    console.log("Is not a number");
    process.exit()
  }
  else {
    console.log('You are born in ' + (2019 - text) + '.');
    process.exit()
  }
})