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:
F: What can I do for you? ,M: I want to check out these books. ,F: Your library card, please? Oh, you have late fees. It comes to $4. You have to pay it off before you can check out more books. ,M: OK, no problem.
(A) F: Sorry, our bookstore is closing now. (B) F: You can apply for a library card over there. (C) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (D) F: Besides, may I see your ticket to the museum? I need to check it out.

Ex Output:
C


Ex Input:
F: Facebook just reported that everyone in the world is only separated by an average number of 3.5 people. ,M: Wow, that doesn't seem possible! I thought the number was supposed to be 6. ,F: That's what scientists originally thought. I think we're all connected even more than Facebook reported actually. The report only included connections between those with a Facebook account.
(A) M: Facebook just reported that everyone in the world is only separated by an average number of 7 people but they don't like to share their lives. (B) M: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (C) M: You think people in the world are closely connected. (D) M: Facebook just reported that everyone in the world is only separated by an average number of 7 people because scientists don't understand social connection.

Ex Output:
C


Ex Input:
M: When do you begin serving dinner? ,F: Let me see. It's 6:30 now so come back in half an hour Sir.
(A) M: I will go there at 6:30. It's 6:00 now so come back in half an hour Sir. (B) M: I’m sorry, I don’t understand. Could you say it again? (C) M: Okay. We will meet at 7:00. It's 6:30 now. (D) M: Dinner will be served at 7:30. It's 7:00 now.

Ex Output:

C