on_the_way_to_annapurna

stores = dict()

while True:
    info = input().split('->')
    command = info[0]

    if command == 'END':
        break

    store = info[1]
    items = []

    if command == 'Add':
        items = info[2].split(',')
        if store not in stores:
            stores.update({store: [item for item in items]})
        else:
            stores[store] += [item for item in items]
    elif command == 'Remove':
        if store in stores:
            del stores[store]

stores = {k: v for k, v in sorted(sorted(stores.items(), reverse=True), key=lambda x: len(x[1]), reverse=True)}

print('Stores list:')
for store, items in stores.items():
    print(store)
    for item in items:
        print(f'<<{item}>>')