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

Example Input: Sentence1: I am hoping you can help me with my planning. I am trying to find information on the trains. Sentence2: I would like to arrive by 13:15. Sentence3: Thank you that is all I needed. Sentence4: itshould be in the centre Sentence5: No. Can you help me find a very cheap, not shabby hotel that has free parking? Sentence6: Your booking has been changed. Your new reference number is FVTMM086 . Sentence7: I can definitely help you with that. Can you give me more information, like your departure and destination preferences? Sentence8: I have a lot of great choices to offer you. Do you have a preference to what part of Cambridge you'd like to stay in? Sentence9: Which one of them has free wifi? Sentence10: I will be departing from Stansted Airport to go to Cambridge on Wednesday. Sentence11: You're welcome, have a great day! Sentence12: There are two guesthouses: Alexander Bed and Breakfast, and El Shaddai. Would you like to stay in one of those guesthouses? Sentence13: I am getting the information up now, do you have a specific arrival or departure time? Sentence14: book for 2 people for 2 nights from wednesday Sentence15: Sorry, can you actually book it for 3 people for 2 nights, please? Sentence16: Both facilities do. Sentence17: TR6386 departs at 12:24 and arrives by 12:52. Would you like a ticket? Sentence18: I made your reservation for 2 people for 2 nights starting Wednesday at the Alexander Bed & Breakfast. Your reference number is 8JX02F2T . Is there anything else I can do? Question: Who has spoken the sentence 13? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: Thank you for your help. Sentence2: do you have one with a star of 4? Sentence3: You're welcome, and have a great day. Sentence4: yes please tyhat you for all your help Sentence5: OK, you have 7 tickets reserved on TR6939. Total due at the station will be 116.2GBP. Your reference number is OK7WYTNQ . Sentence6: Try either one of the cheap ones, I need one that can hold my group of 7 for 5 nights on tuesday. Sentence7: Yes, I'll need 7 tickets. Sentence8: I also need a place to stay. 2 star is my preference. Sentence9: I would like to arrive in Cambridge by 08:45. Sentence10: We have 10 different trains on that day. Do you prefer a particular time? Sentence11: No, thank you. That will be all. Sentence12: TR6939 is your best option. It will leave at 05:39 and arrive at 07:07. Would you like to book passage on that train? Sentence13: In the west part of town. The price doesn't matter. Sentence14: the cambridge belfry was the best match for a large group so I booked you there, the reference number is X33MYBK5 , may I assist with anything else? Sentence15: Have a great time. Sentence16: I do. We have three options. Two that are cheap and one that's expensive. Do you have a preference? Sentence17: I need help finding a train. Can you do that? Sentence18: I don't have any 2 star hotels in that area. Would you like a different area or a higher rated hotel? Sentence19: Okay, do you need a reference number? Sentence20: Of course. Where are you traveling to? Sentence21: I would like to leave Liverpool street on Tuesday and arrive in Cambridge. Sentence22: okay, what area and price range? Question: Who has spoken the sentence 15? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: I was able to book your taxi for you. It will get you to Bedouin by 15:30. Be expecting a blue Honda. Their number is 07893602795. Sentence2: I need a place to dine on crossover food. It should be in the centre Sentence3: Yes, they are a moderately priced guesthouse in the south. They are rated 4stars and include both internet and parking. Sentence4: There are no restaurants that serve crossover food. Is there a different tyoe of food we can search for? Sentence5: Ok, could you also give me some information about the aylesbray lodge guest house? Sentence6: The six of us will be arriving on Thursday. Sentence7: You are very welcome. It has been a pleasure to assist you today. Have a wonderful day and enjoy your trip. Goodbye Sentence8: I can, what are your arrival details? Sentence9: what about african food? Sentence10: There is one called Bedouin. Would you like a reservation? Sentence11: I would, thanks. I need a table for 6 on Sunday, at 15:30. Sentence12: It's just me. Is that necessary though? Sentence13: How many people will be traveling? Sentence14: I also need a taxi that arrives at he restaurant by the booked time. Sentence15: Would you be able to book one of those for me please? Sentence16: I will need to stay 4 nights please. Sentence17: Alright, I've got your booking taken care of and your reference number is 75CDS1UP . Is there anything else I can help you with? Sentence18: Booking was successful. Reference number is : ZF9U0U48 . Sentence19: okay and how long is your stay so I can book the room for you Sentence20: You have been a great help. Thank you so much. Have a wonderful day and keep up the great work. Goodbye Question: Who has spoken the sentence 16? (A) User (B) System
Example Output:
Answer: (A) User