On the Way to Annapurna

stores = {}

while True:
    tokens = input().split('->')
    if tokens[0] == "END":
        break
    else:
        command = tokens[0]
        store = tokens[1]

        if command == "Add":

            store_items = tokens[2].split(',')

            if store not in stores:
                stores[store] = []

            for item in store_items:
                stores[store].append(item)

        elif command == "Remove":
            if store in stores:
                del stores[store]

stores_sorted = sorted(stores.items(), key=lambda a: (len(a[1]), a),  reverse=True)
print('Stores list:')
for key, value in stores_sorted:
    print(f'{key}')
    for item in value:
        print(f'<<{item}>>')