LISP QUESTION

Assume L is list of only integer numbers (Including zeros, or positive, or negative numbers, or could be an empty list), write a function that finds and returns the rightmost even number from this (if any, otherwise return NIL).

Example: for L= (-2, 7, 10, 9, -11, 31, 0, 57, 28, 1) , you should return: 28