I followed the instruction in this video, but when i ran the program, it did not work.

var questions = [
  ['How many states are in the United States?', 50],
  ['How many continents are there?', 7],
  ['How many legs does an insect have?', 6]
];
var correctAnswers = 0;
var question;
var answer;
var response;
var correct;
var wrong;
function print(message) {
 var outputDiv = document.getElementById('output');
  outputDiv.innerHTML = message;
}

function buildList(arr) {
  var listHTML = "<ol>";
  for ( var i = 0; i < arr.length; i += 1) {
    listHTML += "<li>" + arr[i] + "</li>";
  }
  listHTML += "</ol>";
  return listHTML;
}


for (var i = 0; i < questions.length; i += 1) {
  question = questions[i][0];
  answer = questions[i][1];
  response = prompt(question);
  response = parseInt(response);
  if (response === answer) {
    correctAnswers += 1;
    correct.push(question);
  } else {
    wrong.push(question);
}
}
html = "You got " + correctAnswers + " question(s) right."
html += "<h2>You got these questions correct:</h2>";
html += buildList(correct);
html += "<h2>You got these questions wrong:</h2>";
html += buildList(wrong);
print(html);