let standard_input = process.stdin;

// Set input character encoding.
standard_input.setEncoding('utf-8');

// Prompt user to input data in console.
console.log("How old are u ?");

// When user input data and click enter key.
standard_input.on('data', function (data) {
    data = parseInt(data)
    if (typeof data === 'number' && data < 99) {
        // Print user input in console.
        const today = new Date();
        const currentYear = today.getFullYear();
        const age = currentYear - data
        console.log("Your are born in "+age);
    }
    process.exit();
});