text: uni_cars = set()
  while True:
      command = input()
      if command == 'END':
          break
      else:
          direction, plate = command.split(', ')
          if direction == 'IN':
              uni_cars.add(plate)
          elif direction == 'OUT':
              if plate in uni_cars:
                  uni_cars.remove(plate)
  if uni_cars:
      [print(x) for x in uni_cars]
  else:
      print('Parking Lot is Empty')
  
  
  
  