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.

Example Input: M: Good morning, madam. What can I do for you? ,F: I bought this new radio here half a month ago, then I posted it to my daughter who is studying English in Shanghai Foreign Language University. But a week later she posted it back, saying that it doesn't work. I don't know why. Could you help me check out the radio? ,M: Let me see. Did you check it when you bought it?
(A) F: The radio stopped working one day when I was listening to music. It doesn't work anymore. (B) F: I didn't hear you. Please could you tell me again? (C) F: I really need to go back to the post office to take back my radio. (D) F: Maybe. Now the radio stops receiving any program.
Example Output: B

Example Input: F: How often do you exercise? Do you play any sports? ,M: I do sports at school, that's about 3 hours every week. But that's all. I don't do any sports outside of school. ,F: Not even any cycling or walking? ,M: Very rarely. Because my mom takes me to school in the car.
(A) F: Yeah. It's good for your health to go to school by bike, but you enjoy playing sports outside of school, don't you? (B) F: Since you walk to school, you can do five hours of exercise a week. (C) F: I'm sorry, I don't understand. Could you say it again? (D) F: Then you are so happy that your mother can drive you to school.
Example Output: D

Example Input: M: Excuse me, is this seat taken? ,F: No, I don't think so. ,M: Thanks. I am waiting for the train at 9:00 o'clock to Shanghai. Where will you go? ,F: What a coincidence! We are on the same train.
(A) M: Yes, our train to Wuhan will leave at five. (B) M: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (C) M: We both leave at nine, that's coincidental. (D) M: My train will leave at nine and yours is at ten.
Example Output:
C