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

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: Which day would you like to leave? Sentence2: i want to leave on friday Sentence3: I'm looking for a decent place to dine in Cambridge please. Sentence4: Their phone number is 01223324033 and address is Regent Street City Centre. Was there anyting else I could help you with? Sentence5: I would like to book a train to ely, from cambridge. Sentence6: The train should leave after 11:15. Thanks Sentence7: We have 15 italian places Cambridge, do you have and needs as far as area and pricing? Sentence8: how about canapes food? Sentence9: What type of cuisine are you interested in? Sentence10: Sorry, we don't have any places serving canapes food. Would you like to search for something else? Sentence11: Could you please try for Italian ? Sentence12: No thanks. I just need the address, postcode, and phone number for this restaurant please. Sentence13: There are 10 trains that meet your criteria. Do you have a departure time or arrival time in mind? Sentence14: We have a great place on Regent Street City Centre called Pizza Express that you are sure to love. Would you like me to make reservations for you? Sentence15: Train TR0767 leaves Cambridge at 11:50 and arrives at ely at 12:07. The fare is 4.40 pounds. The travel time is 17 minutes. Do you want me to book this? Sentence16: Have a lovely day, goodbye! Sentence17: no thats all the information i needed. thanks Sentence18: Lets try for a moderately priced place in the centre. Question: Who has spoken the sentence 17? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: Yes a table for four please. Sentence2: Yes it is. Would you like a reservation there? Sentence3: Is it expensive? Sentence4: What is the address and postcode of the Backstreet Bistoro? Sentence5: I'm sorry the only mexican restaurant is located in the south. Sentence6: I have found one. The Chiquito Restaurant Bar is in the south side of town. Would you like me to make a reservation for you? Sentence7: They are located at 2 Sturton Street City Centre postal cb12qa, have I been able to resolve all of your questions today? Sentence8: We need a table for Tuesday at 12:30 please. Sentence9: Backstreet Bistro looks like a top choice, shall i book you for there? Sentence10: Thank you. Oh wait! It needs to be a table for 2. Sentence11: We have 4 options! Is there a price range you'd like to stay in? Sentence12: Thanks for all your help. That will be all for today. Goodbye. Sentence13: No problem. What day and time were you thinking? Sentence14: Have a great time. Sentence15: Actually, I was looking for a Mexican restaurant in the centre of town. Sentence16: I will go ahead and book that for you. Sentence17: What about a gastropub? Sentence18: I also want to find an attraction called Corpus Christi. Sentence19: i'm looking for a mexican restaurant Sentence20: Corpus Christi is a college in town centre. It is located at king's parade, postcode cb21rh. The entrance fee is 2 pounds. Do you need their phone number? Sentence21: Yes, I'm looking for a restaurant in the expensive price range in the city centre. Mexican is my first choice. If none is available, gastropub is fine. Sentence22: You are booked for Backstreet Bistro for 2 people. Your reference number is P4P2R28V . May I help with something else? Question: Who has spoken the sentence 13? (A) User (B) System
Example Output:
Answer: (B) System