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

console.log(`What's your age ?`);
process.stdin.on("data", age => {
  const stringToNumber = Number(age);
  if (typeof stringToNumber === "number" && stringToNumber <= 99 && stringToNumber >0) {
    console.log(` You was born in ${2019 - stringToNumber}`);
  } else {
    console.log('Please you must enter a number greater than 0');
  }
  process.exit();
});