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 need to go to the bank. ,F: But they're all close today? ,M: Closed? Are you kidding? What is it? Some kind of holiday today?
(A) F: Hey, calm down. Just joking, The post office is right behind you. (B) F: I am afraid I did not quite catch what you were saying. Please repeat it. (C) F: Hey, calm down. Just joking, there's no bank in the town. (D) F: Hey, calm down. Just joking, which bank do you want to go?

Ex Output:
D

Ex Input:
F: How soon will Nancy come back?
(A) M: Well, I see Amy just once every two months. (B) M: Thanks for your concern. She will come back in a month. (C) M: I am afraid I did not quite catch what you were saying. Please repeat it. (D) M: You are right! Amy will go the university in a month.

Ex Output:
B

Ex Input:
F: Hello, China Travel Agency. Can I help you? ,M: Yes, I'd like to travel to London. So I want to make a reservation for me on May fourth. ,F: Just a moment, please. I'm sorry, but the flights are fully booked on that day. The next available flight is on May fifth. They have 2 flights: one at 9:30 AM and the other at 2:00 PM. Both flights have seats available.
(A) M: I didn't hear you. Please could you tell me again? (B) M: So, as a stewardess, you mean the flights are not fully booked on that day? (C) M: Really? As a booking clerk, you mean they have one flights: at 9:30 AM? (D) M: So, you mean as a customer, you mean the next available flight is on May third?

Ex Output:
A