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Lists
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Before Kattis
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#. Write a function ``find_in_list(element, a_list) -> bool:``

    * The function will ``return`` ``True`` if ``element`` exists within the list ``a_list`` and ``False`` otherwise
    * This can use either a ``for`` loop or a ``while`` loop

#. Write a function ``index_of(element, a_list) -> int:``

    * The function will ``return`` the index of the first occurrence of ``element`` within the list ``a_list`` and ``-1`` if it is not found
    * This can use either a ``for`` loop or a ``while`` loop

#. Write a function ``replace_all(the_list, find, replace):``

    * This function will replace all occurrences of ``find`` within ``the_list`` and replace them with ``replace``
    * This function must ``return`` the modified list
    * For example, ``replace_all([1, 2, 2, 3], 2, 9)`` -> ``[1, 9, 9, 3]``

#. Use the ``replace_all`` function to change the list ``[1, 2, 2, 1]`` -> ``[2, 1, 1, 2]``

    * You will need to use ``replace_all`` multiple times