def compute_string_properties(string):
    """Given a string of lowercase letters, returns a tuple containing the
    following three elements:
        0. The length of the string
        1. A list of all the characters in the string (including duplicates, if
           any), sorted in REVERSE alphabetical order
        2. The number of distinct characters in the string (hint: use a set)
    """
    distinct = set(string)
    mytuple = (len(string), list(reversed(sorted(string))), len(distinct))

    return mytuple