title: Print a list within a list by searching an element
body: <p>I have a list of list like follows:</p>
  <pre><code>lists = [['a', 'b'],['c', 'd']]
  </code></pre>
  <p>I want to input an element between a and d. Then search for the list that contains that element and print it, like this:</p>
  <pre><code>request = input('Input character: ')
  if request in lists:
  print() #list that contains the character the user inputted
  </code></pre>
  <p>So if the user inputs 'a', I want it to print the list ['a', 'b']. How can I do that?</p>