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: Is there anything else I can help you with Sentence2: Okay! What is your departure site? Sentence3: Okay, I've got you a black bmw with the contact number 07083984796. Sentence4: Thank you so much! Sentence5: I need to book a taxi to come pick me up by 10:30 to take me to Midsummer House Restaurant. Sentence6: I'm coming from city stop restaurant. Question: Who has spoken the sentence 1? (A) User (B) System

Ex Output:
Answer: (B) System

Ex Input:
Sentence1: Yes, I am looking for places to go in the centre area. Sentence2: Yes, please. I need a booking for 4 people and will need the reference number. Sentence3: Yes, please get me their entrance fee and postcode. Sentence4: Yes our family likes to swim! Sentence5: Great! I have those trains up. May I now get where you are traveling to? Sentence6: We have many fine attractions in the center of town. Is there a particular type you're looking for? Sentence7: Their entrance fee is not in our system and they are in cb11ly Sentence8: I am goint to London Kings Cross and should arrive by 21:45. Sentence9: Great! There is just one swimming facility in the central zone: Parkside Pools. Would you like their contact information? Sentence10: I am looking to book a train that departs from cambridge on saturday Sentence11: Thanks, you, too. Sentence12: Have a great day. Sentence13: Would a swimming pool work in its place? Sentence14: I have booked your tickets. Your reference number is GW9K5282 . Can I help with anything else today? Sentence15: Sure, I have a train arriving at 19:51 TR0427. Would you like to book it? Sentence16: Thank you. That's all I need for today. Sentence17: You're welcome! Bye! Sentence18: I would like a mutilple sports attraction please. Question: Who has spoken the sentence 4? (A) User (B) System

Ex Output:
Answer: (A) User