Treasure Hunt

treasure_chest = input().split('|')

command_input = input()
stolen_list = []
while command_input != 'Yohoho!':
    command_args = command_input.split()
    command = command_args[0]
    if command == 'Loot':
        items = command_args[1:]
        for item in items:
            if item not in treasure_chest:
                treasure_chest.insert(0, item)
    elif command == 'Drop':
        index = int(command_args[1])
        if index < 0 or index >= len(treasure_chest):
            command_input = input()
            continue
        removed_item = treasure_chest.pop(index)
        treasure_chest.append(removed_item)
    elif command == 'Steal':
        number = int(command_args[1])
        if number >= len(treasure_chest):
            number = len(treasure_chest)
            idx = 0
        else:
            idx = len(treasure_chest) - number
        stolen_list = treasure_chest[idx:idx+number:]
        del treasure_chest[idx:idx+number:]
        if any(stolen_list):
            print(', '.join(stolen_list))

    command_input = input()

length = [len(s) for s in treasure_chest]
if len(treasure_chest) > 0:
    sum_length = sum(length) / len(treasure_chest)
    print(f'Average treasure gain: {sum_length:.2f} pirate credits.')
else:
    print('Failed treasure hunt.')