(function () {
    let checkButton = document.querySelector('button');

    checkButton.addEventListener('click', () => {
        let year = Number(document.querySelector('input').value);
        let isLeap = 'Not Leap Year';

        if (year !== 0 && (((year % 4 === 0) && (year % 100 !== 0)) || year % 400 === 0)) {
            isLeap = 'Leap Year';
        }

        document.querySelector('#year h2').textContent = isLeap;
        document.querySelector('#year div').textContent = year;

        document.querySelector('input').value = '';
    });
})();