def checkUnfollowed(new_list, old_list):
    """
    Checks if elements in the old list are still present in the new list
        if not present, saves it into a list of users (that is, users that unfollowed)
    :param new_list: A list of followers generated in this execution
    :param old_list: A list of followers generated in the previous execution
    :return: A list of the difference between the two list (unfollowed)
    """
    unfollowed = list()
    for j in old_list:
        if j in new_list:
            pass
        else:
            unfollowed.append(j)
    return unfollowed