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: F: Welcome to our program. Today we have invited Fred Watson, an expert on the environment to talk to us.
(A) M: Nice to meet you guys. Let' s talk about environmental problems today. (B) M: Hello, everyone! My name is Bob, today, let' s talk about modern technology. (C) M: I'm sorry, I don't understand. Could you say it again? (D) M: Thanks, I' glad to be your studio. Today, our topic is about industrial development.
Example Output: A

Example Input: M: Let's meet at 20 to 5. ,F: Well, could we make it 20 past 5? ,M: That's a bit late for me. I could manage 10 past. ,F: OK, see you then.
(A) M: I'm sorry, I don't understand. Could you say it again? (B) M: That would be great. Make it 5:10. (C) M: Since you want 10 past 5, let's meet then. (D) M: Sure, 5:40 is ok.
Example Output: B

Example Input: M: Are you free on Wednesday evening? I'd like to invite you to have dinner. ,F: I'm terribly sorry. I've already made arrangements for Wednesday. ,M: That's a pity! How about Thursday evening? ,F: That would be fine.
(A) M: Then we'll have dinner together on Wednesday evening. (B) M: That's fine. We'll have dinner together on Thursday evening. (C) M: I'm sorry, I didn't understand. Could you repeat a little louder, please? (D) M: Let's have dinner on Sunday evening? Is that OK?
Example Output:
B