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

Example Input: Sentence1: You're very welcome. Thank you and goodbye! Sentence2: The earliest train departs Leicester at 05:09 and arrives in Cambridge at 06:54. The cost is 37.80 pounds per ticket. Sentence3: That's all that I need. Sentence4: Any of those will work. Which one is your favorite and where is it located? Sentence5: I'll be departing from Leicester, headed to Cambridge. What do the prices look like? Sentence6: No problem. There are a lot of other options like boating, cinema, colleges, a concerthall, museums, nightclubs, a park, theatres and swimming pools. What are your interests? Sentence7: I also need a train on Wednesday, arriving by 19:00. Sentence8: I'm looking for something to do in the centre of town. Sentence9: Travel time is approximately 105 minutes. Sentence10: Would you like any more information on other attractions? Sentence11: I would really like it to be a attraction type. Sentence12: What is the travel time? Sentence13: Great! I found a lot of things that match what you're looking for. Do you like architecture? Sentence14: I can help you with that. What are the departure and destination cities you were looking for? Sentence15: No, that will be all. Thank You for all your help. Sentence16: I'd try the cambridge contemporary art museum, at 6 trinity street. Question: Who has spoken the sentence 13? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: Enjoy your day. Good bye. Sentence2: The address is colville road, cherry hinton. Sentence3: That is all I need, thank you. Sentence4: Sure, I can get you aboard a 15:21 arriving at 17:06. Would you like me to book a seat aboard TR9839? Sentence5: Sounds good. What is the postcode, please? Sentence6: You're welcome! Have a great day! Sentence7: Of course. The Cherry Hinton Village Centre has multiple sports in the east end of town. Sentence8: There are quite a few running all day to many different stations. Where would you like to go? Sentence9: I need a train leaving cambridge on thursday. Sentence10: I would like to go to Leicester and get there by 18:45 Sentence11: The postcode is cb19ej. Is there anything else I can help you with? Sentence12: Good bye. Sentence13: Thank you for using our service. have a good day! Sentence14: Oh wait! Before you go, can you give me some information on the cherry hinton village centre? Sentence15: Yes, may I have their address, please? Sentence16: Not right now. Thanks for the information though! Have a great day! Goodbye. Question: Who has spoken the sentence 4? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: I prefer Chinese. Something is the expensive price range Sentence2: The Cambridge Belfry is hotel in the west, within the cheap price range. What information on the hotel would you like? Sentence3: Yes. the cambridge belfry offers free parking. Is there anything else I can help you with or would you like me to book it? Sentence4: On Friday. I also need a 4 star hotel in the west. Sentence5: I actually preferred moderate, but lets go with the expensive option. Sentence6: Hakka is located on Milton Road, Chesterton, cb41jy. When would you like your reservation? Sentence7: Ok, I've booked you a taxi from the hotel and restaurant. It will be a red volkswagen. the contact number: 07761073818 Sentence8: No, thanks, but I do need a taxi between the hotel and the restaurant, leaving the hotel at 23:15, please. Sentence9: Thank you,thats all I need today. Sentence10: We have one in the cheap and one in the expensive range. Which would you prefer? Sentence11: Thanks for contacting us! Sentence12: do they offer free parking? Sentence13: I'm sorry, I've checked my budget and really need to go with the cheap hotel. Could you just give me the information on that one? No booking today. Sentence14: I'd like to get the address and postcode. Yes, I'd like a reservation please. This place sounds great. Sentence15: Hello I'd like to get some information on a place to eat in the north side of Cambridge. Sentence16: Hutington Marriot is an expensive 4-star hotel on Kingfisher Way. It's phone number is 01480446000. Should I book that for you? Sentence17: I would suggest the hakka it is chinese in the north and is expensive. Would you like to make reservations? Sentence18: We have 9 restaurants to chose from. There are Italian, Indian, French, Chinese, European and Asian Restaurants. What sound good to you? Question: Who has spoken the sentence 6? (A) User (B) System
Example Output:
Answer: (A) User