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

Example Input: Sentence1: The TR1156 leaves at 15:16. Will that work for you? Sentence2: There are 13 colleges in the centre of town. Would you prefer a college without an entrance fee? Sentence3: Yes can I have an arrival time please? Sentence4: I need a train on Saturday after 14:30. Sentence5: I need to travel to Norwich from Cambridge after 14:30. Sentence6: Okay thank you for your help. Sentence7: I'm looking for a place to in the centre, perhaps a college. Sentence8: No preference. Can you make a recommendation and give me the address, phone number, and entrance fee? Sentence9: The arrival time is 16:35. Sentence10: Thank you for using Cambridge TownInfo Centre. Sentence11: Where are you leaving from and traveling to? Sentence12: christ's college is great. the address is st andrews st, free entrance & their number is 01223334900, anything else? Question: Who has spoken the sentence 1? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: The postcode is CB58BS. Can I help you find anything else? Sentence2: Can you tell me what their star rating is? Sentence3: I need something in the south and free parking. Sentence4: I will be in the centre of cambridge. I am looking for any type of attraction involving architecture. Sentence5: You're very welcome, I'm glad that I could help. I hope that you enjoy your stay! Goodbye. Sentence6: Of course! They are a 3-star establishment. Would you like me to go ahead and book that for you? Sentence7: thats it, thanks! Sentence8: Bridge Guest House was available for 2 nights. Your reference number is ULWMFZAX . What else can I do for you today? Sentence9: I'm sorry. There is no availability. Would you like to try different dates or another hotel? Sentence10: I'd recommend All Saints Church on Jesus Lane. Did you need help with anything else? Sentence11: I would recommend the Bridge Guest House based on your criteria. Would you like me to book you a room? Sentence12: There are 33 places to stay, do you have any requirements? Sentence13: How about just 2 nights instead? Sentence14: yes, 7 people 4 nights starting Wednesday. Sentence15: I need a place to stay. Sentence16: Can you give me the postcode for that? Question: Who has spoken the sentence 4? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: That is all. Thank you for your help. Sentence2: What about Christ's college? it's free to get in. Sentence3: Okay, your reference number is 1A7ZKZ7F . Is there anything else you need? Sentence4: I am looking for places to go in town. Sentence5: Thank you for contacting Cambridge TownInfo centre. I hope you have a pleasant trip! Goodbye! Sentence6: Yes. I need to book for one. Sentence7: There are 10 trains fitting your criteria. Do you a time preference on arrival or departure? Sentence8: Train ID TR9236 leaves at 13:35 and arrives in Ely at 13:52. Would you be interested in booking that option? Sentence9: There aren't any attractions of that type in the Centre unfortunately, do you have an alternative preference? Sentence10: Sure, it is located on Saint Andrew's Street, postcode cb23bu. Admission is free. Can I be of further help today? Sentence11: Yes, it will need to leave after 12:30. I'll just book it for one person to cambridge. Sentence12: We have many options to choose from, is there a particular type of place you are interested in seeing? Sentence13: Somewhere in the Centre, entertainment. Sentence14: Can you give me the address for Christ's college please? Sentence15: Yes, I need a train coming from Ely on Friday. Sentence16: I could also go to a college instead. Question: Who has spoken the sentence 7? (A) User (B) System
Example Output:
Answer: (B) System