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 are your specials today? ,M: We have our usual soup and fruit salad, the soup choices are tomato soup and mushroom soup.
(A) F: Oh, as a fruit store, how can you not have any specials. (B) F: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (C) F: Yeah, but your supermarket doesn't have fruit salad, right? (D) F: Why doesn't your restaurant have fruit salad?

Ex Output:
B


Ex Input:
F: How long have you been living in this city, Jack? ,M: Let me see. I came to this city when I was 23 years old. So 5 years now. ,F: Do you like living in the big city? ,M: Not so much. Air pollution has become such a big problem here now.
(A) F: I agree with you. Heavy traffic is a serious problem. (B) F: I agree with you. Air pollution is not a serious problem. (C) F: I am afraid I did not quite catch what you were saying. Please repeat it. (D) F: I agree with you. Air pollution should be paid more attention to.

Ex Output:
D


Ex Input:
M: Excuse me, would you mind if I use the stapler? ,F: Help yourself. It's on the desk over there. Oh, I'm sorry. It has been lent out.
(A) M: Somebody else take the stapler. (B) M: Somebody else take the book.I just take the stapler right away. (C) M: I’m sorry, I don’t understand. Could you say it again? (D) M: You owned the stapler.

Ex Output:

A