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

Ex Input:
Sentence1: No thank you. Can I have to phone number and postcode for that restaurant? Sentence2: I need a train to Kings Lynn. Sentence3: Thank you for using our service. Sentence4: The earliest train leaving after 17:00 on Friday leaves at 17:11. Would you like me to book this train for you? Sentence5: That would be TR9226 Sentence6: The phone number is 01223247877. It's located in the cb13nl postcode. Sentence7: Hmmm....how about an expensive restaurant serving gastropub food in the east? Sentence8: Thank you, goodbye. Sentence9: I am looking for a restaurant in the east that serves international food. Sentence10: No. There are two moderately priced restaurants with international cuisine in the centre of town. Would you like to hear about those? Sentence11: Book it, please. I need a single ticket. Sentence12: The the missing sock fits that criteria and is in the cheap price range. How else can I assist you? Sentence13: What day would you be wanting to travel? Sentence14: There's one restaurant that fits your requests, would you like me to book a reservation? Sentence15: Thanks again for the information! Sentence16: Have a great time. Sentence17: Have a great day as well. I think you'll love the Royal Standard. Sentence18: Thank you so much. Have a nice day! Sentence19: Friday please. From Cambridge leaving after 17:00 Sentence20: Can you give me the train ID on that one please? Sentence21: Is there one in the expensive? Sentence22: You have been booked for the train. Your reference number is 0UIC4MX9 . Can I help you with anything else? Question: Who has spoken the sentence 20? (A) User (B) System

Ex Output:
Answer: (A) User

Ex Input:
Sentence1: You're very welcome. Thank you and goodbye! Sentence2: The earliest train departs Leicester at 05:09 and arrives in Cambridge at 06:54. The cost is 37.80 pounds per ticket. Sentence3: That's all that I need. Sentence4: Any of those will work. Which one is your favorite and where is it located? Sentence5: I'll be departing from Leicester, headed to Cambridge. What do the prices look like? Sentence6: No problem. There are a lot of other options like boating, cinema, colleges, a concerthall, museums, nightclubs, a park, theatres and swimming pools. What are your interests? Sentence7: I also need a train on Wednesday, arriving by 19:00. Sentence8: I'm looking for something to do in the centre of town. Sentence9: Travel time is approximately 105 minutes. Sentence10: Would you like any more information on other attractions? Sentence11: I would really like it to be a attraction type. Sentence12: What is the travel time? Sentence13: Great! I found a lot of things that match what you're looking for. Do you like architecture? Sentence14: I can help you with that. What are the departure and destination cities you were looking for? Sentence15: No, that will be all. Thank You for all your help. Sentence16: I'd try the cambridge contemporary art museum, at 6 trinity street. Question: Who has spoken the sentence 13? (A) User (B) System

Ex Output:
Answer: (B) System

Ex Input:
Sentence1: What day were you thinking of traveling on? Sentence2: Yes, the address is Cambridge passenger crusiers, jubilee house. Their phone number is 01223902091. I'm not sure about the entrance fee. You could call them and find out? Sentence3: The duration is 88 minutes. Is there anything else I can help you with? Sentence4: What's the duration of the trip? Sentence5: welcome and thanks for using our services. Sentence6: On Thursday. I need to arrive by 20:45 Sentence7: Can you give me the phone number, address and entrance fee? Sentence8: As mentioned, it is TR7360. It leaves liverpool on thursday at 17:39. It arrives at cambridge at at 19:07. The cost is 16.60 pounds per ticket. Sentence9: I need a train to take me to Cambridge departing from London Liverpool Street. Sentence10: Okay. Thank you for your time! Sentence11: we have riverboat georgina Sentence12: Yes, I also need a boat type of place to go in the north. Sentence13: Have a great day. I am all set. Goodbye. Sentence14: Before I let you go, has everything been resolved or are there other questions? Sentence15: That would be fine. I'll need the travel time, departure time, and train ID, please? Sentence16: May I suggest train TR7360 arriving at 19:07? Question: Who has spoken the sentence 7? (A) User (B) System

Ex Output:
Answer: (B) System