class User:
    def __init__(self, name):
        self.name = name
        self.messages = []


class Message:
    def __init__(self, sender, content):
        self.sender = sender
        self.content = content


def filter_messages(sender, messages):
    messages_to_return = []
    for current_message in messages:
        if message.sender == sender:
            messages_to_return.append(current_message)
    return messages_to_return


all_users = {}
while True:
    data = input().split()
    if data[0] == 'exit':
        break
    if len(data) == 2:
        all_users[data[1]] = User(data[1])
    else:
        if data[0] in all_users.keys() and data[2] in all_users.keys():
            all_users[data[2]].messages.append(Message(data[0], data[3]))

user_names = input().split()
user_1 = all_users[user_names[0]]
user_1.messages = filter_messages(user_names[1], user_1.messages)
user_2 = all_users[user_names[1]]
user_2.messages = filter_messages(user_names[0], user_2.messages)

if len(user_1.messages) == 0 and len(user_2.messages) == 0:
    print("No messages")
else:
    while len(user_1.messages) != 0 or len(user_2.messages) != 0:
        if len(user_2.messages) != 0:
            message = user_2.messages[0]
            print(user_1.name + ": " + message.content)
            user_2.messages.remove(message)
        if len(user_1.messages) != 0:
            message = user_1.messages[0]
            print(message.content + " :" + user_2.name)
            user_1.messages.remove(message)