You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Both trains cost 10.10 pounds per ticket. Sentence2: I am looking for a restaurant to dine at in the centre of town. Could you recommend me any expensive places to try? Sentence3: Yes several. I'd recommend the Cambridge Chop House,Midsummer House Restaurant or Fitzbillies Restaurant Sentence4: I found two trains that will do that, one will leave at 5:40, and one will leave at 6:40, which would you like to book? Sentence5: I think I'm all set. Thank you very much! Sentence6: I found 404 trains leaving on Friday. What is your departure and destination locations? Sentence7: All three serve British Cuisine. Sentence8: No problem! Have a great trip! Sentence9: I'll be going to stansted airport from cambridge, and I need to arrive by 8:00. Sentence10: As long as it will be arriving by 08:00 it doesn't really matter which one, but I need the price of each ticket please. Sentence11: Great thank you so much. Sentence12: Would you still like me to book a ticket for you or are you satisfied at this point? Sentence13: What type of food do those places serve? Sentence14: Alright, would you also be able to help me find a train? I'm looking to leave on Friday. Question: Who has spoken the sentence 13? (A) User (B) System
Output:
Answer: (B) System