process.stdin.resume()
process.stdin.setEncoding("utf8")
console.log("What's your age ? ")
process.stdin.on("data", age => {
  const year = 2018
  const yOb = year - age
  if (age < 99 && Number.isInteger(yOb) && age > 0) {
    console.log(yOb)
  } else {
    console.log("Wrong entry, please input a correct number")
  }
   process.exit()
})