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: I'll pick you up at 10:45 tomorrow morning. ,F: How long will the journey last? It's a 3 and a half hour drive. And we should give ourselves 40 minutes to have lunch and another 10 to wait for the ferry.
(A) M: Your flight will take off at 10:45. (B) M: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (C) M: I want to travel to Chicago by train. (D) M: Don't worry, we have enough time to go on board.

Ex Output:
D


Ex Input:
F: Excuse me, could you tell me how to get to the Water Cube from here? ,M: You can take a bus or a taxi. But the traffic is very heavy at the moment. So you'd better take the subway.
(A) F: Thanks for the advice, I'm definitely going to take the subway. (B) F: I take the subway to school every day. (C) F: You mean I should take a bus? (D) F: I’m sorry, I don’t understand. Could you say it again?

Ex Output:
A


Ex Input:
M: Does this bus go to the railway station? ,F: No, it goes to the Science Museum. You can get off at the next stop and take the number 15.
(A) M: I like visiting the science museum a lot. (B) M: I will wait for you at the no. 15 bus stop. (C) M: I’m sorry, I don’t understand. Could you say it again? (D) M: Thank you, is number 15 bus stops right in front of the railway station?

Ex Output:

D