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.

Ex 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?

Ex Output:
D


Ex Input:
F: Did you have a busy week? ,M: Uhm, well, no. I mean I didn't do a lot, but I bought a computer. ,F: You did? Thank goodness. Now you don't need to borrow mine. You had it for 2 weeks last time. ,M: Yeah, so sorry about that. I wrote my history paper on it. Thanks again by the way.
(A) F: It's OK. I know that you borrowed it for your history paper. (B) F: Excuse me, could you repeat the question? (C) F: Why was your last computer broken? Your borrowed mine for a month last time. (D) F: It's OK. I remembered you borrowed it for the computer class for a month last time.

Ex Output:
A


Ex Input:
F: Excuse me, can you tell me how to get to the language arts building? ,M: Sure. Follow campus center walk in the garden, then turn right onto the bridge. ,F: OK. ,M: Take a left after the bridge. The language arts building is the first building on the right. It's across from the physical education building.
(A) F: So, the language arts building is the second building on the right and it is on the right of the bridge? (B) F: I’m sorry, I didn’t understand. Could you repeat a little louder, please? (C) F: OK, I see. You mean the  language arts building is the first building on the left and it is at the end of Campus Center Walk? (D) F: So, you mean I should turn a right after the bridge and the language arts building is opposite the Physical Education building?

Ex Output:

B