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

Ex Input:
Sentence1: Where will you be travelling to? Sentence2: Yes but I need that to be booked for 3 people. I would like the reference number please. I also need a place to stay as well. Sentence3: Sure thing, I would suggest this one acorn guest house. Sentence4: I will be traveling to Leicester and would like to arrive before 21:15. Sentence5: I would like a 4-star guesthouse in the north in a moderate price range. Sentence6: Great can you book that for me from Sunday for 2 nights for 4 people. Sentence7: I would like to arrive by 21:15. Sentence8: When could you like to arrive by? Sentence9: Your booking was successful. Your reference number is 7ZJ4CTTG . Will that be all for today? Sentence10: Booking was successful, the total fee is 113.4 GBP payable at the station. Your reference number is ABKFF3SH . What type of place are you looking for? Sentence11: I'm looking for a train that leaves from Cambridge on Tuesday. Sentence12: I have the TR8207 that will arrive by 21:06. Would you like me to book that for you? Question: Who has spoken the sentence 4? (A) User (B) System

Ex Output:
Answer: (A) User

Ex Input:
Sentence1: That will work. What is the price and arrival time for that? Sentence2: Where would you like to travel from and to? Sentence3: Sure, I have 7 trains that would work. The closest to your requested time is the TR5110 that leaves at 20:34. Sentence4: That will cost you 16.50 pounds and you will arrive by 21:24. Sentence5: Certainly. Home from Home is a guesthouse on the north end of the city. It offers free internet and parking and is moderately priced. Would you like to book a room? Sentence6: The train should depart from cambridge and travel to peterborough. Sentence7: You too. Goodbye. Sentence8: I would like to book a train that is running on Tuesday and departs anytime after 20:15, can you help me with that? Sentence9: Thank you have a nice day. Sentence10: Your booking was successfull! Reference number is I5VKNKJ3 Sentence11: That is great. I also want to know about a hotel called home from home. Can you find it for me. Sentence12: Yes. I would like to book for 8 people for 3 nights starting from Saturday. Question: Who has spoken the sentence 9? (A) User (B) System

Ex Output:
Answer: (B) System

Ex Input:
Sentence1: Wandlebury's address is Wandlebury Ring, Gog Magog Hills, Babraham, postcode cb223ae. No entrance fee. La Mimosa is located in the city centre, address is Thompsons Lane Fen Dilton. Anything else? Sentence2: Have a great day, goodbye. Sentence3: Could you book a table for me please? I need a reservation for 8 people at 15:45 on Friday. Sentence4: Can you please provide me with the postcode, entrance fee and address of a park in the south? Sentence5: How about getting me the address and postcode and entrance fee for The Wandlebury. I also am looking for a restaurant called La Mimosa. Sentence6: Thanks I will. That is everything I needed. Sentence7: Hi there, can you help me find a park to visit please? Sentence8: We have 79 parks in the Cambridge area, what area of Cambridge would you like to go to a park in? Sentence9: All right, your table is reserved. The reference number is SX6ZASAF . Sentence10: There are two parks in the south, The Wandlebury and Sheeps Green. Which are you more interested in? Sentence11: You're welcome. Enjoy your time in Cambridge. Sentence12: That's all I need, thanks for the help! Question: Who has spoken the sentence 11? (A) User (B) System

Ex Output:
Answer: (B) System