Updates input values on button click

HTML

<h3>
	<span class="q">How many roads must a man walk down?</span>
	<span class="a">42</span>
</h3>
<input class="q" placeholder="Question" value="How many roads must a man walk down?">
<div>
  <button class="minus">-</button>
  <input class="a" type="number" value="42">
  <button class="plus">+</button>
</div>

JavaScript

$(function() {
  $("input").change(function() {
    $("span.q").text($("input.q").val());
    $("span.a").text($("input.a").val());
  })
  $("button.minus").click(function() {
    $("input.a").val(parseInt($("input.a").val()) - 1).trigger("change");
  })
  $("button.plus").click(function() {
    $("input.a").val(parseInt($("input.a").val()) + 1).trigger("change");
  })
})