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

Example Input: Sentence1: It doesn't matter, I just need to get there. Sentence2: I am sorry but that time is not available. Would you like to try another time or day perhaps? Sentence3: There is a restaurant called restaurant alimentum that meets your criteria. Sentence4: It's all booked, you're looking for a black volkswagen and their contact number is 07263669645. Sentence5: As a matter of fact, it appears all of the gastropubs in Cambridge have closed. Is there anything else that interests you? Sentence6: Have a great day! Sentence7: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 8HB62Z6W . Is there anything else I can help you with? Sentence8: Sure. What time would you like to leave the restaurant? Sentence9: I am looking for a gastropub in the south. Sentence10: The address is cambridge leisure park, clifton way. Can I do anything else for you? Sentence11: Yes, I'd like to see some entertainment near the restaurant. Could you recommend me something good? Sentence12: Are there any Gastropubs in town? Sentence13: Yes, it is. Nusha is in the South as well. Sentence14: Yes, I would like to book a taxi from the restaurant to the entertainment. Sentence15: How about Tenpin in the south? Sentence16: Great, thank you so much for your help! That's everything I'll need today! Sentence17: Thank you for contacting Cambridge TownInfo centre. Goodbye! Sentence18: That will do. Please get me their address. Sentence19: How about a modern European cuisine in the south area? Sentence20: Let's book that for 12:45 on Tuesday. It will be for 7 people. Sentence21: I'm sorry I couldn't find any Gastropubs in the South. Is there another type or area which you would like to try? Sentence22: Splendid! Thank you for all your help. That's all I need. Goodbye. Sentence23: Could you try 11:45 please? Sentence24: Is it located near Alimentum? I'm looking for something in the same area as the restaurant. Question: Who has spoken the sentence 4? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: Does it have four stars? Sentence2: Not yet, but can you tell me what time the train arrives in Ely please? Sentence3: acorn guest house is located in 154 chesterton road should i book it for you? Sentence4: I would like to leave on Tuesday after 18:00. Sentence5: It arrives by 20:07! Anything else love? Sentence6: TR5511 leaves Cambridge for Ely at 20.07. Do you need tickets? Sentence7: I've booked your stay at the Acorn Guest House, and your reference number is IT07BRTC . Sentence8: The trip will last 17 minutes. Is there anything else you would like to know? Sentence9: Do you know what day or time you want to leave? Sentence10: Thank you for using Cambridge TownInfo centre. Please consider us for your future travel needs. Sentence11: I need some lodging accommodations. It needs to have free parking and Internet please! Sentence12: I would like someone to book me a place with free parking and internet. Sentence13: That should do it. Thanks so much for your help! Sentence14: I found 29 hotels matching your request. What price range and area of town would you prefer? Sentence15: Thanks a lot. Can you also help me find a train going to Ely? Sentence16: Yes. Please book it for 2 people for 4 nights starting Friday. Sentence17: Yes it does. Shall I book? Sentence18: What is the total travel time on that time? Question: Who has spoken the sentence 15? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: No thank you I just need their postcode and phone number please. Sentence2: Does the hotel have free wi-fi? Sentence3: I am looking for places to go in Cambridge. I was thinking about visiting a college. Any suggestions? Sentence4: Certainly, Christ's College is free and located at Saint Andrew's Street, cb23bu. Is there anything else I can help with today? Sentence5: Yes it does and parking. Would you like me to book a room for you? Sentence6: that is all for now. thanks for your help. Sentence7: Can you help me find the Limehouse hotel? Sentence8: Thanks for using this service. Have a nice day. Sentence9: The post code is cb42je. The phone number is 01223300552. Sentence10: Would you be interested in visiting Christ's college located in the city centre on Saint Andrew's Street? Sentence11: That sounds great, I'll need the address and entrance fee information, please. Sentence12: Sure can. It's a moderately priced, 4 star guest house at 78-80 milton road. Question: Who has spoken the sentence 4? (A) User (B) System
Example Output:
Answer: (A) User