Exercise: Maximum Occurrence |2|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Write a function named *maximum_occurrence* which takes one input as a
*list of integers* and returns the *integer* in the list that occurs the
most. It is guaranteed that the number of occurrences of items in the
list will be different from each other.

.. container:: sampleio

   Sample I/O:

.. |2| image:: ../../figures/difficulty_two.png
   :class: difficulty

.. code:: default

   >>> maximum_occurrence([1,1,1,0,4,4])
   1

   >>> maximum_occurrence([0,3,3,3,1,0])
   3