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

console.log('What is your age ?')
process.stdin.on('data', (number) => {
    let dob = -1;
    if (number >= 0 && number <= 99) {
        dob = 2019 - number;
        let dob1 = dob - 1;
        console.log('Then you are born in the year ' + dob + ' assuming you have already celerated your birthday this year, in which case you are born in ' + dob1);
        process.exit();
    } else {
        console.log('Invalid input!');
        process.exit();
    }
})