P3

command = input()
stats = {}

while command != "Statistics":
    current_command = command.split("->")[0]
    username = command.split("->")[1]

    if current_command == "Add":

        if username not in stats:
            stats[username] = []
        else:
            print(f'{username} is already registered')

    elif current_command == "Send":
        email = command.split("->")[2]
        stats[username].append(email)

    elif current_command == "Delete":

        if username in stats:
            del stats[username]
        else:
            print(f'{username} not found!')

    command = input()

stats = dict(sorted(stats.items(), key=lambda x: (-len(x[1]), x[0])))

print(f'Users count: {len(stats)}')

for key, value_list in stats.items():
    print(key)

    for email in value_list:
        print(f' - {email}')