10. ForceBook

collected_data = {}
data = input()

while not data == "Lumpawaroo":
    is_found = False
    if "|" in data:
        side, user = data.split(" | ")
        for current_side in collected_data:
            if user in collected_data[current_side]:
                is_found = True
                break
    else:
        user, side = data.split(" -> ")
        for current_side in collected_data:
            if user in collected_data[current_side]:
                collected_data[current_side].remove(user)
    if is_found:
        data = input()
        continue
    if side not in collected_data:
        collected_data[side] = []
    collected_data[side].append(user)
    if "->" in data:
        print(f"{user} joins the {side} side!")
    data = input()

collected_data = [(side, user) for side, user in sorted(collected_data.items(), key=lambda kvp: (-len(kvp[1]), kvp[0])) if len(user) > 0]

for side, user in collected_data:
    user = sorted(user)
    print(f"Side: {side}, Members: {len(user)}")
    for current_users in user:
        print(f"! {current_users}")