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:
M: Hi, Alice! Got any plans after the class? ,F: Not really. What about you? ,M: We will have our midterm exams next month. I plan to look for some important books and study at the library. Do you want to join me? ,F: Sure. I need to return some books. They're due today. Besides I can also read some weekly magazines and newspapers. ,M: Great. We can go to the swimming pool in the gym after that. ,F: That sounds like a good idea. We can cool down a little in such a hot summer. Are you good at swimming? ,M: Well, that's a good question. I haven't swam for almost 2 years. I think I need more practice. ,F: Oh, it's almost 9:00 AM. I need to hurry. I am running late now. See you after class in front of the library then. Bye. ,M: See you then.
(A) F: Excuse me, could you repeat the question? (B) F: See you after class in front of the library. (C) F: See you in front of the library tomorrow. (D) F: See you in front of the classroom tomorrow.

Ex Output:
B


Ex Input:
F: Excuse me, are you going to buy that textbook? ,M: Well, yeah, I need it for a class. But it's awfully expensive. ,F: Oh, we must be in the same class! Civil engineering? ,M: Yes, that's the one! ,F: Were you there last Friday for the first class? ,M: Yes. I only moved here last Monday, and I registered for the class last Tuesday. By the way, I thought Professor Qian really seemed to know his subject.
(A) F: Great. Since you moved here last month, you must have your first class last Monday. (B) F: Yes. It is great that you registered for class last Monday and had your first class last Tuesday. (C) F: His courses are great. You must learnt a lot of Civil Engineering in your first class last Friday. (D) F: I am afraid I did not quite catch what you were saying. Please repeat it.

Ex Output:
C


Ex Input:
F: Good morning, doctor Vincent. May I come in? ,M: Good morning, ma'am. Of course, how can I be of help? ,F: Well it's about school, doctor Vincent. It's just that Alan and I wanted to have a few people over for a dinner party to celebrate finishing my paper and we would particularly like to invite you since you're the chairman, would you please come this weekend on Saturday?
(A) M: OK. Since I am the chairman, I will come to the party on Friday. (B) M: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (C) M: Sure. It is my honor to join the breakfast party as a doctor. (D) M: Since I have helped you with your paper, I will come to the party tonight.

Ex Output:

B