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

Example Input: Sentence1: It does not matter, I just need one available for 7 people at 18:15 on thursday Sentence2: I'm sorry, nothing is coming up for that particular type of restaurant. Is there any other specifics you may like? Sentence3: The reference number is DVDLH9NK . Is there anything else I can help you with? Sentence4: Unfortunately I could not find any guesthouses meeting those requirements. Sentence5: How many stars is Cityroomz? Sentence6: Before I can book your taxi, what time are you wanting to leave or arrive by? Sentence7: Fantastic. Enjoy your trip! Sentence8: Not yet. I would like you to book a taxi for me between my hotel and restaurant. I will need the car type and contact number. Sentence9: It has a zero star rating, is this ok? Sentence10: I also need the reference number please. Sentence11: I just want to be sure it arrives by the booked time at the restaurant. Sentence12: Cityroomz is the only place that matches your criteria. Sentence13: That is fine. Do they have internet? Sentence14: I have made a reservation at restaurant alimentum for you. Your table will be reserved for 15 minutes. The address is 152 - 154 Hills Road. Sentence15: How about one that serves modern european food? Sentence16: Thank you very much for your help! That was everything I needed. Sentence17: How about a hotel type? Sentence18: There are 3 restaurants serving modern european food, would you prefer one on the south side or town centre? Sentence19: Yes, Cityroomz has internet. Would you like to book it? Sentence20: Booked. Your car type is white skoda and contact number is 07075801794 Sentence21: Can you find me restaurant with moderate prices that serves north indian cuisine? Sentence22: Yes, I also need a guesthouse hotel with moderate prices in the centre. I don't need free parking. Question: Who has spoken the sentence 15? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: That was a successful booking, your reference number is T6C83P46 . Sentence2: Thank you so much! Sentence3: Not really. Anything would be fine. Sentence4: Yes, please. I'd like to book it for 6 people and 5 nights starting from monday. Sentence5: I'm not too concerned with location, but I would like it to include internet and have a 4 star rating please. Sentence6: Do you have a preferred location or price range? Sentence7: Yes, how about 3 nights? Sentence8: I recommend the Acorn Guest House. Would you like a room there? Sentence9: I'm looking for a guesthouse with free parking. Sentence10: Booking unsuccessful. Want to try for a shorter stay? Sentence11: There are 16 guesthouses that meet those requirements. Any preference on price range? Sentence12: You're so welcome. Thank you. Question: Who has spoken the sentence 1? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: There are 5 restaurants that fit your request. Are you interested in a specific type of food? There are 2 chinese, one indian, one italian, and one mexican. Sentence2: I also am looking for an expensive restaurant in the area of south, thank you Sentence3: Yes I would like the number and I also need to know what star rating the hotel has. Sentence4: That hotel has a 4 star rating and the number is 01223316074. Would you like to book that now? Sentence5: Thanks, that's everything I need. Have a nice day! Sentence6: To you as well! Goodbye. Sentence7: Great your reference number is XJVS7TQN Sentence8: Please make a reservation for tuesday. Sentence9: Can you help me find the hotel Worth House? Sentence10: On what day will you be dining there? Sentence11: Could you book me a table for 1 at the Indian restaurant for 11:15? I would also like the reference number. Thank you! Sentence12: The Worth House is located in the northern part of town at 152 Chesterton Road, would you like the phone number? Question: Who has spoken the sentence 9? (A) User (B) System
Example Output:
Answer: (B) System