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

Example Input: Sentence1: Are you sure? I'd really like some Austrian food. Sentence2: Yes I am sure. However, I do have a number of restaurants listed as serving European food. Would you like information on these? Sentence3: Thank you, let us know if you need any more help with anything. Sentence4: The phone number is 01223307030. The address is Quayside Off Bridge STreet and the postcode is cb58aq. Can I book a reservation? Sentence5: Yes please. I prefer the centre of town if possible. Sentence6: I would like for that to be cheap as well. Sentence7: No, I'm all set, thanks. Goodbye! Sentence8: Hi, I'm looking for a cheap austrian restaurant. Sentence9: Sounds good. Could you give me the number? Also, the address and postcode. Sentence10: The River Bar Steakhouse and Grill located in the Centre has cheap Modern European food. Would you care for that? Sentence11: There are a number of European options in the town centre. Do you have a price range? Sentence12: I'm sorry but I don't have any Austrian restaurants? Would you like to try a different cuisine? Question: Who has spoken the sentence 5? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: No, but I would like to find a cheap priced south african restaurant. Sentence2: I'm sorry, but we don't have and South African restaurants in the area. Is there a different type of food I can help you find? Sentence3: I would say let's look for an attraction first. Can you recommend something to do in the south part of town? Sentence4: I will go with whatever you recommend, I just need the attraction type and postcode. Sentence5: Hi, I am looking forward to trying some of your local restaurants. I do need help with some other places to go in town while I am there though. Sentence6: There are several nice parks in the area as well as theaters and museums. Sentence7: The byard art museum postal code is cb21sj. Can i help you get transportation to and from the museum? Sentence8: Try Portuguese then. Sentence9: Thanks so much for putting up with me! You've been great! Sentence10: 3 people will be dining. Please give me a reference number once you finish the reservation Sentence11: I would rather be in the south area. Sentence12: What is your food type preference? Sentence13: There are two results. Both are cheap. Do you prefer the south or centre? Sentence14: I have finished booking it for Thursday at 12:15 for 3 people at Nando, your reference number is TDQZGM38 . Do you need anything else? Sentence15: Can you book a table for me there on Thursday at 12:15? Sentence16: The only option is nandos. Sentence17: You are welcome enjoy Sentence18: How many people are in your party? Question: Who has spoken the sentence 15? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: I am interested in a guesthouse in the north that includes free wifi please. Sentence2: Thanks. I need to grab a train ticket to Stevenage on Friday, also. Sentence3: I need to leave sometime after 14:45 from Cambridge. Sentence4: The Acorn Guesthouse is a moderately priced guesthouse in the north, and it includes free WiFi. Would you like to book it? Sentence5: Alright, hope your train ride goes smooth! Sentence6: I was able to book the room for you. The reference number is 3UQIM80C . Can I help you with anything else? Sentence7: That guesthouse actually is not located in the north. However, I can offer you ten different guesthouses all that have free internet access. Sentence8: How about moderately priced? Sentence9: That won't be any trouble. What time do you intend to travel, and how many tickets do you need? Sentence10: Hi I am looking for a guesthouse to stay at that includes free wifi. Sentence11: We have 10 guesthouses that meet your needs. Which price range do you prefer? Sentence12: You can find a and b guest house on 124 tension road for a moderate price and it includes wifi. Sentence13: The ticket price for the departure at 15:21 is 12.80 pounds. How else may I assist you? Sentence14: TR8135 departs Cambridge for Stevenage on Friday at 15:21. Sentence15: That sounds perfect. Can I get the price for the tickets? Sentence16: Sure. I'm traveling alone this time. Book me for 2 nights, beginning Wednesday. Sentence17: Is that hotel in the North? Sentence18: That will be all. Thank you! Question: Who has spoken the sentence 4? (A) User (B) System
Example Output:
Answer: (A) User