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

console.log('How old are you?')

process.stdin.on('data', (text) => {

    if (isNaN(text)) {

        console.log('A number is required');
    } else if (text > 99 || text <= 0) {
        console.log('Too old or too young!!')
    } else {
        let currYear = new Date().getFullYear();
        let calcul = currYear - text;
        console.log('so you are born in ' + calcul)
        process.exit()
    }

})