class Channel:
    def __init__(self, channel_id, channel_name):
        self.channel_id = channel_id
        self.channel_name = channel_name
        self.channel_users = []
        self.channel_owners = []
        self.channel_messages = []

    def add_user(self, u_id):
        self.channel_users.append(u_id)

    def remove_user(self, u_id):
        self.channel_users.remove(u_id)

    def add_owner(self, u_id):
        self.channel_owners.append(u_id)

    def remove_owner(self, u_id):
        self.channel_owners.remove(u_id)

    def add_message(self, message_id):
        self.channel_messages.insert(0, message_id)

    def remove_message(self, message_id):
        self.channel_messages.remove(message_id)