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: M: Can we go somewhere and talk about your experience abroad? It's noisy in the cafe. ,F: Shall we go to the tea house upstairs? ,M: But I need to get some fresh air. ,F: Well, there's a park nearby. It's usually not crowded at this time of day.
(A) M: I’m sorry, I don’t understand. Could you say it again? (B) M: Great, the air in the park is comfortable (C) M: Ok, then go to the tea house downstairs you have mentioned. (D) M: Ok, I'd like to share with you my experience abroad in the cafe.
Example Output: B

Example Input: F: Look at the monkeys running around on the rocks. They are so lovely. ,M: Yes, their surrounding seems to suit them very well. Let's go over and see the panda now.
(A) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (B) F: Before we go, do you know where is the toilet in this zoo? (C) F: Excuse, how much are these in total? (D) F: I can't find this museum's exit.
Example Output: B

Example Input: M: The party has begun. Helen hasn't come here yet, did you forget to invite her? ,F: I did invite her yesterday. She planned to come, but she changed her mind this morning. She had to attend a piano class.
(A) M: I’m sorry, I don’t understand. Could you say it again? (B) M: I knew that Helen forgot the party time, so she didn't show up. (C) M: You forgot to invite Helen to the party! (D) M: Fine. So Helen chose to take the piano lesson and refused to come to the party.
Example Output:
A