title: Link similar elements in list python to create a dictionary
body: <p>I am a beginner in python.</p>
  <p>I have these 2 lists:</p>
  <pre><code>a=['a','b','c','c','d']
  b=['1','2','3','4','5']
  </code></pre>
  <p>Now, I want to  create a dictionary where key is the index position and values are a list of the elements of same elements.</p>
  <pre><code>a=['a','b','c','c','d']
  b=['1','2','3','4','5']
  
  d={a[i]:b[i] for i in range(len(a))}
  print(d)
  </code></pre>
  <p>Expected output:</p>
  <pre><code>{0: ['a', '1'], 1: ['b', '2'], 2: ['c', '3'], 3: ['c', '4'], 4: ['d', '5']}
  </code></pre>
  <p>Currently, this is the code I have above. I am not sure how to continue forward. Please help me!</p>
  <p>Also, if something obvious is missing, please be gentle <code>:)</code></p>