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

Example Input: Sentence1: Yes, how about a museum in the centre? Sentence2: What is their address? Sentence3: I want a cheap restaurant that serves polynesian food. Sentence4: How about italian? Sentence5: I need it to arrive at the restaurant by the booked time. Sentence6: You are booked and your reservation number is Q7YR4YLN Sentence7: Looking now La Raza has a few openings, how many people? Do you have a date and time in mind? Sentence8: The castle galleries is a free museum in that area. Sentence9: I am afraid I have none matching your request. Would you like to try another type of food or area? Sentence10: Hi, I'm looking for entertainment attractions that are available in the centre. Sentence11: Can you help me get a taxi? Sentence12: There are no entertainment attraction located in the centre. Would you like me to check different areas? Sentence13: Of course. I need the time of travel, departure location and the destination. Sentence14: great, i have 69 options for you in that area! Sentence15: The la raza serves spanish food. Its cheap and in the centre. Would you like me to book you a table there? Sentence16: Your taxi is a blue skoda under the contact number 07244814493. Is there anything else? Sentence17: Can you try spanish food instead? Sentence18: You're welcome, glad I could help. Sentence19: Yes! Please do. Sentence20: I'd like it for Saturday at 17:45, just one person. Sentence21: That is all thanks. Sentence22: I am also looking for a restaurant in the same area as the attraction. Sentence23: There's nothing that serves spanish food in the cheap price range in the centre of town? Sentence24: unit su43, grande arcade, saint andrews street anything else i can help you with? Question: Who has spoken the sentence 9? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: Booking was successful for Tuesday. Your Reference number is : 0J3V1091 . Sentence2: I'm sorry that doesn't seem to be available would you like me to try a different day or guesthouse? Sentence3: I'm sorry, there does not seem to be a historical site or hiking area in Cambridge. Is there anything else I can help with? Sentence4: Sure, I can help you with that. What section of town were you looking for? Sentence5: Doesn't really matter if they offer either of those or not. I just want it to be a 0 star hotel. Sentence6: Then the city centre north b and b is what you want, shall I book you? Sentence7: i don't really care about the area. Sentence8: I want to see local sights, can you help? Sentence9: I like hiking and seeing historical sites. Sentence10: Okay. Are you interested in hotels that offer internet and/or parking? Sentence11: Yes, I would like to find a hotel in the cheap price range? Sentence12: Yes, a guesthouse is fine. I was looking for zero stars and in the cheap price range. Sentence13: Great, thanks. I don't need anymore help. Goodbye! Sentence14: Yes, please book it for me. Sentence15: I'm sorry, I seem to be having an error in my system. You want a booking at the citycentre north B&B for 6 people, 5 nights, on Monday? Sentence16: I'm also looking for somewhere to go. Perhaps the college. Can you tell me the postcode for the college? Sentence17: City Cenrtree North and B is a cheap hotel,would you like me to book it for you ? Sentence18: Let book the same but on Tuesday instead. Sentence19: I'm happy I could help today. Goodbye! Sentence20: There are 18 colleges in town. I recommend christ's college in the centre. The postcode is cb23bu. Sentence21: Yes, there is a wide variety, do you have an activity type that your are interested in? Sentence22: Yes please, 6 people for 5 nights and we would be arriving Monday. Question: Who has spoken the sentence 21? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: yes i am rich I need expensive Sentence2: Yes, I'm celebrating a special occasion, so money is no object. Is A and B an expensive, 4-star guesthouse? Sentence3: We have 19 trains that meet that criteria, where will you be departing from? Sentence4: Great. I'm glad I could be of help. Sentence5: Will you only need 1 ticket? The train will leave Cambridge at 15:36. Sentence6: Thank you for calling. Sentence7: Have a nice day. Sentence8: the travel time is 79 minutes. anything else today? Sentence9: I don't have a expensive guesthouse. Sentence10: No. Thanks. Sentence11: Yes please book TR6524 on tuesday leaving at 14:45 going to norwich from cambridge. Please confirm departure time. Thank you. Sentence12: Yes please, I'm looking for a guesthouse with free wifi. The area doesn't matter. Sentence13: There are a few available. I highly suggest the University Arms Hotel. Would you like to book a room? Sentence14: I found a result for A and B Guest House in east that has internet. Would you like more info? Sentence15: how about a hotel type instead? Sentence16: Yes, please book for 5 people, for 4 nights starting on friday. Sentence17: I just need the train travel time , please. Sentence18: Hello, I need to take a train to Norwich on Tuesday, can you please tell me what's available? Sentence19: Booking was successful the Reference number is : ECPE3KUV . Is there anything else I can assist you with? Sentence20: Train TR6524 would work for you. Would you like me to book you passage? Sentence21: cambridge and should leave after 14:45 Sentence22: A and B guesthouse is moderately priced. Could you like an expensive guesthouse instead? Question: Who has spoken the sentence 19? (A) User (B) System
Example Output:
Answer: (B) System