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

Example Input: Sentence1: Yes, I can! When and what time would you like to go? Also how many people is the reservation for? Sentence2: The address for Christ's College is Saint Andrew's Street. Sentence3: Great. Thank you for your help. Sentence4: Thank you. Will the taxi arrive at the restaurant by 16:00? Sentence5: Is there an entrance fee for the college? Sentence6: It has been booked the reference number is E8J6X7ZH the table will be reserved for 15 minutes. Sentence7: I've booked your taxi! A Grey Volkswagen will you pick you up and take you to the restaurant. The contact number is 07776457787. Can I help you with anything else? Sentence8: Yes, the taxi is due to arrive at 16:00. Sentence9: There are 13 colleges to visit in the centre. Are you interested in visiting christs college? Sentence10: I need to book a table for 7 people at 16:00 on Tuesday. Sentence11: Great. I'm looking for Midsummer House Restaurant also. Can you help me book it? Sentence12: There is no entrance fee for Christ's College. Sentence13: It's my pleasure. Let me know if you ever need anything else. Sentence14: Sounds great. What is the address? Sentence15: Hi! Can you tell me a little bit about the colleges that are in the center of town? Sentence16: I also need a taxi between both places to arrive by the booked time Question: Who has spoken the sentence 10? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: You're welcome, enjoy your day. Sentence2: How about Downing College? It has free admission and is located on Regent Street/ Sentence3: I'd like to visit a college in the center of town. Could you help me find something interesting? Sentence4: That sounds great! Can I have their phone number and postcode, please? Sentence5: No, that was all I needed to know. Thank you, you've been very helpful. Sentence6: Downing College's phone is 01223334860 and their postcode is cb21dq. Can I help you with anything else today? Question: Who has spoken the sentence 4? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: That will work, can you reserve 7 seats for us on that train please? Sentence2: I'm going to cambridge and I need a train that leaves on wednesday. Sentence3: Booking was successful. Reference number is : SY83O0SO . Sentence4: What kind of food would you like ? Sentence5: That is all I need, thank you! Sentence6: I would recommend Lovell Lodge on the north side. It is moderately priced and has internet and parking. Sentence7: Where will you be departing from and what time do you need to arrive in Cambridge? Sentence8: I'd like to leave from Standsted sometime after 15:30. Sentence9: I'm sorry I don't need a restaurant, I need to find a hotel that has 2 stars. Sentence10: I was able to book for you. The reference number is DSE7LBCU . Sentence11: Thank you can you help me find a place to eat as well? Sentence12: the TR1342 leaves at 16:24 Sentence13: Have a wonderful stay. Sentence14: That sounds great. Book it for me for 7 people for 4 nights starting from the same day. Question: Who has spoken the sentence 5? (A) User (B) System
Example Output:
Answer: (B) System