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.

Input: Consider Input: F: One ticket to Chicago, please. ,M: Yeah, Ok, that's $24.00. ,F: Does this one have a dining car? ,M: Yeah, there is a dining car and a snack bar. Here's your change. ,F: Thanks.
(A) M: Why isn't there a dining car? We are on the train, aren't we? (B) M: So although we are in the dinning hall, there is no snack bar, right? (C) M: Why isn't there a dinning hall in the ticket office? (D) M: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that?

Output: D


Input: Consider Input: M: When does your flight take off, Mary? ,F: At 3:15 PM. There are just 2 hours left so I'm leaving now.
(A) M: I’m sorry, I don’t understand. Could you say it again? (B) M: I didn't realize it is 1:15 p.m. now. (C) M: It's 2:15 p.m. now. Your flight will take off in two hours. (D) M: It's 3:15 p.m. now. Your flight has taken off, hasn't it?

Output: B


Input: Consider Input: F: Where shall we go for coffee in town? ,M: How about the cafe near the bus station? ,F: That's always so crowded. We can try that new one next to the library.
(A) M: I’m sorry, I don’t understand. Could you say it again? (B) M: Let me tell you, there's a new cafe near the library outside the town, and the coffee tastes good. (C) M: Wow, there is a new cafe next to the library? Let's go and have a try. (D) M: Alright, since the old cafe near the library is closed, let's go to the new cafe beside the park.


Output: C