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

console.log('What\'s your age ? ')
process.stdin.on('data', (age) => {
    let birthDate = 0;
    if(isNaN(age)) {
        console.log('Not a integer !');
        process.exit()
     } else {
        if(age > 99 && age < 0) {
            console.log('Error');
        } else {
        birthDate = 2019 - age;
        console.log('Your birth is: ', birthDate);
        process.exit()
        }
    return birthDate;
  }
})