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

console.log('How old are you ? ');
process.stdin.on('data', (text) => {
  console.log('I am ' + text);

  let yearBirth = 2019- text;
  if (text > 99){
    console.log("trop vieux");
    process.exit();
  }
  if (text < 0){
      console.log("pas possible");
      process.exit();
  }
  const num = parseInt(text);
  if(text != num){
      console.log("nan")
      process.exit();
  }
console.log(yearBirth);

  process.exit();
})