def diff(list1, list2):
    """
    Difference between unique elements of lists

    :type list1: list
    :param list1: first list
    :type list2: list
    :param list2: second list
    """
    c = set(list1).union(set(list2))
    d = set(list1).intersection(set(list2))

    return list(c - d)