03. Inventory

collected_items = input().split(", ")
input_line = input()

while input_line != "Craft!":
    command, item = input_line.split(" - ")
    if command == "Collect":
        if item not in collected_items:
            collected_items.append(item)
    elif command == "Drop":
        if item in collected_items:
            collected_items.remove(item)
    elif command == "Combine Items":
        old_item, new_item = item.split(':')
        if old_item in collected_items:
            collected_items.insert(collected_items.index(old_item) + 1, new_item)
    else:
        if item in collected_items:
            collected_items.append(collected_items.pop(collected_items.index(item)))
    input_line = input()

print(", ".join(collected_items))