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

console.log('How old are you ? ')
process.stdin.on('data', (number) => {
    if(number > 99){
        console.log("Are you sure about that?");
    } else if(isNaN(number)) {
        console.log("That is not a number");
    } else {
        const year = 2019-number;
  console.log('2019' - (number))
    }
  process.exit()
})