In this task you are given a small conversation between two persons and 4 options on how the conversation should continue. Your job is to choose the most reasonable option. The conversation and the options are separated by a newline character. Each dialogue in the conversation are separated by a comma. F and M indicate female and male, respectively.

Input: Consider Input: F: Hello, China Travel Agency. Can I help you? ,M: Yes, I'd like to travel to London. So I want to make a reservation for me on May fourth. ,F: Just a moment, please. I'm sorry, but the flights are fully booked on that day. The next available flight is on May fifth. They have 2 flights: one at 9:30 AM and the other at 2:00 PM. Both flights have seats available. ,M: That's great. I'd like to take the first available flight. What's the fair, please? ,F: 2250 yuan. ,M: Here is 2300 yuan.
(A) F: Okay, as you want to take the last available flight, you have to pay 2,300 yuan in total. (B) F: Really? You mean here is 3300 yuan? Oh, actually you just have to pay 2,250 yuan in total. (C) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (D) F: Well, as you want to travel to London and take the first available flight, you have to pay 2,350 yuan in total.

Output: C

Input: Consider Input: F: Look at the monkeys running around on the rocks. They are so lovely. ,M: Yes, their surrounding seems to suit them very well. Let's go over and see the panda now.
(A) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (B) F: Before we go, do you know where is the toilet in this zoo? (C) F: Excuse, how much are these in total? (D) F: I can't find this museum's exit.

Output: B

Input: Consider Input: M: Lily, I can't catch up with the English teacher very well. ,F: What's the problem? ,M: You are quite good at English. Can you help me with it? ,F: Sure, but you'd better take an additional course in some English schools. ,M: English schools? What's that? ,F: This kind of school is good at helping people to improve their English. ,M: Is that different from our school's English course? ,F: Yes. Before you start your training, they will test you on your English first.
(A) M: Why do they charge such high fees? What's more, how can they know my English ability without any tests? (B) M: Our high school will test my English before training, right? (C) M: Why do they need to test my English before training? (D) M: Excuse me, could you repeat the question?
Output: C