title: Merge Python List
body: <p>I have a list </p>
  
  <pre><code>a = [[1,2],[3,4],[5,6],[7,8],[9,10]]
  </code></pre>
  
  <p>Result</p>
  
  <pre><code>New_a = [[1,3,5,7,9],[2,4,6,8,10]]
  </code></pre>
  
  <p>Any smart way or python built-in function can solve the problem?</p>