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: F: Excuse me, are you going to buy that textbook? ,M: Well, yeah, I need it for a class. But it's awfully expensive. ,F: Oh, we must be in the same class! Civil engineering? ,M: Yes, that's the one! ,F: Were you there last Friday for the first class? ,M: Yes. I only moved here last Monday, and I registered for the class last Tuesday. By the way, I thought Professor Qian really seemed to know his subject.
(A) F: Great. Since you moved here last month, you must have your first class last Monday. (B) F: Yes. It is great that you registered for class last Monday and had your first class last Tuesday. (C) F: His courses are great. You must learnt a lot of Civil Engineering in your first class last Friday. (D) F: I am afraid I did not quite catch what you were saying. Please repeat it.
Example Output: C

Example Input: F: How dangerous it was and how lucky the girl was. ,M: Yes, but for the passerbys quick action the girl would have been run over by the car.
(A) F: Yes, there was traffic accident. How bad luck the girl has. (B) F: I am really sorry, I did not catch that. Would you slow down, please? (C) F: The girl is badly ill. (D) F: I hate that thief.
Example Output: B

Example Input: F: I like that photo on the wall. ,M: Oh, thank you. It's a photograph that I took on my vacation last month.
(A) F: Really? That photo on the wall was taken on your conference last week? (B) F: You mean that you took the photo on the wall on your vacation last month, right? (C) F: OK, I see. You took that photo on the desk last month. (D) F: I am afraid I did not quite catch what you were saying. Please repeat it.
Example Output:
B