title: How to sort a list by length and then in reverse alphabetical order
body: <p>For example:</p>
  
  <pre><code>a=['a','b','zzz','ccc','ddd'] #before sorting
  
  a=['b','a','zzz','ddd','ccc'] #after sorting
  
  a.sort(key=len)
  </code></pre>
  
  <p>sorts the data but in alphabetical order but How to sort in the list by length and then in reverse alphabetical order ?</p>