title: sorting a counter in python by keys
body: <p>I have a counter that looks a bit like this:</p>
  
  <pre><code>Counter: {('A': 10), ('C':5), ('H':4)}
  </code></pre>
  
  <p>I want to sort on keys specifically in an alphabetical order, NOT by <code>counter.most_common()</code></p>
  
  <p>is there any way to achieve this?</p>