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: Hello Martin, long time no see. I heard you went to France to study, how was that? ,M: I was only there for a year, then I took a year off to travel around Europe. ,F: Where did you go? ,M: I went to Switzerland first and then Germany in Austria. I was planning to end my trip in Italy, but it didn't work out. ,F: Oh well, is it good to be back? ,M: Of course, but I'm returning to France to finish my degree. It's a four-year program.
(A) F: Really? You are returning to Italy to finish your degree and you need two years for your degree? (B) F: I am afraid I did not quite catch what you were saying. Please repeat it. (C) F: So, you mean it's a four-year program and now you need three years for this degree? (D) F: Really? You are not returning to France to finish you degree? Oh, you need four years for this degree!
Example Output: C

Example Input: M: Talking about the future. I think there will be huge changes in the way people use cars. Laws will be made about what kind of car you can own and when you can use it. ,F: Maybe they'll just be too many of them on the roads. The air will be so seriously polluted that nobody will be able to breathe normally. ,M: Exactly. People will have to rely on trains.
(A) F: I am afraid I did not quite catch what you were saying. Please repeat it. (B) F: I see. You believe that trains will change a lot while cars remain the same, so people would choose trains more often. (C) F: Why do you think that cars will be the most common kind of transportation many years later? (D) F: Oh, why you think people will rely on trains in the future?
Example Output: D

Example Input: F: Hello, who's that? ,M: Hello, Mrs Black. I'm David. I'm coming to fix your TV set. ,F: Oh, come in please. ,M: But where is the TV? In the living room? ,F: No, not this one. This way please. It is laid in the bedroom. The old one which we bought when we got married. ,M: Oh, let me turn it on. Yes, it's really a little old, the scene is not clear. Why not change it? ,F: Well, it can mark the old days so I'd like to keep it. Can you help me make it better? ,M: Sure, I'll try my best. Perhaps it needs a new kinescope. Please wait for a moment.
(A) F: Well. I don't want to save money. I'm going to buy a new TV set. (B) F: OK. That new TV set helps me to remember the old days. (C) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (D) F: Well. It can decorate the living room.
Example Output:
C