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

console.log('What\'s your age ? ')
process.stdin.on('data', (text) => {
	let annee = new Date().getFullYear();
	let calcul;
	if (isNaN(text)){
		console.log("Please use only numeric value");
	} else if(text <= 0 || text >= 99){
		console.log("Please enter a number between 1 and 99.")
	} else {
		calcul = annee - text;
		console.log("Your year of birth is "+ calcul+" .");
	}
  process.exit()
})