On the Way to Annapurna

stores = []

command = input()

while command != 'END':
  tokens = command.split('->')
  store= tokens[1]
  if tokens[0] == 'Add':
    items= tokens[2].split(',')
    filtered = [x for x in stores if x[0] == store]
    if filtered:
      idx = stores.index(filtered[0])
      stores[idx][1].extend(items)
    else:
      stores.append([store, items])
  elif tokens[0] == 'Remove':
    filtered = [x for x in stores if x[0] == store]
    if filtered:
      idx = stores.index(filtered[0])
      del stores[idx]
  command = input()

sorted_stores = sorted(stores, key=lambda x: (len(x[1]), x[0]), reverse=True)
print('Stores list:')
for i in sorted_stores:
  print(i[0])
  [print(f'<<{x}>>') for x in i[1]]


  #sorted(sorted(stores, key=lambda x: x[0], reverse=True), key=lambda x: len(x), reverse=True)