happy new year!

koco.js

(() => {
  let p = 0;
  const
    ucb = p => new Promise(r => r(alert('happy new year!'))),
    l = () => document.addEventListener('keydown', el),
    cb = () => ucb(document.removeEventListener('keydown', el)).then(l),
    k = [76,82,85,68,97,98], 
    co = [2,2,3,3,0,1,0,1,5,4],
    el = e => {
      p = k[co[p]] - e.key.charCodeAt(Math.min(e.key.length-1, 5)) ? 0 : ++p===10 ? cb()||0 : p;
      return true;
    };
  l();
})();