You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Example Input: Sentence1: I do not care about the area but I would like it to be expensive. Sentence2: How about the Gonville Hotel which is centrally located? It has internet and is expensive. Sentence3: I found 5 hotels matching your request. I would recommend Huntingdon Marriott Hotel located in the west. It has a 4 star rating. Sentence4: Will you be needing a reference number? Sentence5: On what day will you be checking in? Sentence6: 4 people will be staying Sentence7: I also need a place to stay? Sentence8: Your table will be reserved for 15 minutes. Your reference number is GDZZ5T1Y . Can I assist you further? Sentence9: That is all, thanks. Sentence10: Booking was successful. Reference number is : M6FRXJOV . Sentence11: I have many to choose from. Do you have a preference for internet or parking? Sentence12: Alright! How many people will be staying starting what day? Sentence13: There are 11 European style restaurants. What price ranges are you looking for? Sentence14: Yes, I would like it to have internet. Sentence15: That sounds perfect. Let's book it. Sentence16: There are 33 hotels to choose from. Can we narrow this down? Are you interested in a particular part of town or specific price range? Sentence17: Expensive price range. Please book it for 4 people at 18:15 on Monday Sentence18: Can you help me find some european food in Cambridge? Sentence19: How about price range? The hotel should also be very expensive. I won't settle for less and neither will Fi-Fi. Sentence20: I will be staying on Monday. Sentence21: Yes I will definitely need that. Sentence22: Great. If you need help in the future, please contact us. Enjoy your stay. Question: Who has spoken the sentence 16? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: I'm also looking for a restaurant in the centre of town that serves chinese food. Sentence2: I need to leave bishops stortford. Do you have a train going out? Sentence3: The Ugly Duckling sounds interesting! What's their address? Sentence4: I'd like to go to Cambridge and would be leaving on Thursday after 16:30. What is available then? Sentence5: Fantastic, have a great day! Sentence6: They are 10.10 pounds each Sentence7: I have 4 choice for you. The Ugly Duckling, Tang Chinese, HK Fusion, and the Sesame Restaurant and Bar. Does one of these sound like something you would like to try? Sentence8: No thank you. That is all. Sentence9: The Ugly Duckling is located at 12 St. Johns Street City Centre. Their postcode is cb21tw. Is there anything more I can help with? Sentence10: There's a train that leaves at 17:29 and arrives by 18:07. Does that sound okay? Sentence11: I am sure I do, where would you like to go? Sentence12: Yes, that would work. What is the price of a ticket? Sentence13: There are several Chinese restaurants in the centre of town. What price rnge are you looking for? Sentence14: I prefer something expensive. Question: Who has spoken the sentence 13? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: Booking was successful. The table will be reserved for 15 minutes. Reference number is : LIF9IWL5 . Anything else. Sentence2: Great. I was able to book your ride for you. Your driver will be in a yellow Volvo and you can reach them at 07341534913. Sentence3: Yes, there are 3 - Fitzbillies Restaurant, The Cambridge Chop House, and Midsummer House Restaurant. My favorite is Midsummer House Restaurant - utterly decadent! May I reserve a table for you? Sentence4: Cool, thank you! I won't be needing anything else. Have a good day! Sentence5: Yes, Restaurant One Seven is located in the centre of town, as are 4 other restaurants with British food. Sentence6: It is in a moderate price range. Sentence7: Any type is fine, so please list all 44 attractions. Sentence8: Is it expensive? I'd like to really paint the town red! Sentence9: No it's free to enter, anything else? Sentence10: Just whether or not they have an entrance fee. Sentence11: Is there a restaurant in the Centre that serves British food and is in the expensive price range? Sentence12: Yeah, I'm going to be looking for some british food. Sentence13: Great, I hope you have a lovely time in town! Sentence14: There are 44 attractions in your area. Can you let me know what type of attraction you are interested in. Sentence15: Yes. Reserve a table for 1 person at 16:30 on Tuesday. Sentence16: Yes, i'm looking for places to go in the same town as the restaurant, any ideas and may I know the entrance fee, if there is one please? Sentence17: Are any of those options located in the centre of town? Sentence18: There are several restaurants close to your location, how about one called, restaurant one seven? The restaurant is located on De Vere Univeristy Arms Regent Street City Centre. Sentence19: all saints church is a great place. Would you like to know more ? Sentence20: Just a taxi to get me from the church to the restaurant by the reservation time. Question: Who has spoken the sentence 4? (A) User (B) System
Example Output:
Answer: (A) User