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: Hello, American Medical Association. Can I help you? ,M: I want to find a doctor. ,F: What kind of doctor are you looking for? A general doctor or a specialist? ,M: What is the difference between a general doctor and a specialist? ,F: A general doctor treats a variety of illnesses and will treat your whole family. A specialist concentrates in one area, like the heart or the skin. ,M: Then I would like to find a general doctor. ,F: In that case, you may want to call Doctor Green at 6663579 or Doctor Smith at 6668520.
(A) M: Thank you for telling me those treatments. I'll call Doctor Brown later. (B) M: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (C) M: Thank you for helping me make the appointment with the lawyer. (D) M: Thank you for all your information. That helped a lot.

Ex Output:
D


Ex Input:
F: Can I help you, sir? ,M: Yes, I'm here to see the cars. ,F: Thank you. We have many brands. Do you have any particular brand in mind? ,M: Yes, I want to have a Ford. I need it badly for my work. But I don't have a lot of money. It must be very expensive, isn't it? ,F: Yes. Look, this model is newly developed and began to appear in the market just several weeks ago in America. It cost $43,800. But considering the high quality, it's worth it. ,M: That's why I shall choose it. But I'm afraid that I can't afford to pay in cash now. Can I pay regularly for the car in a year? ,F: Oh, yes. You can pay each month or the first time $13,800. And you must pay the remaining part in 12 months.
(A) M: Since, the way of payment is ensured, then please fill these files first. (B) M: I’m sorry, I don’t understand. Could you say it again? (C) M: You don't have to worry about the quality of the car, daddy! (D) M: The function of the car is pretty good, you can have a try my son.

Ex Output:
A


Ex Input:
F: How do you know how old a star is? ,M: For most stars, we find its age from how big it is. We can know its size from the amount of light it puts out and its color. Then the size tells us how long a star will live. Big stars live a short life, while small stars live much longer. ,F: I've always wondered if there is an end in space. Do you think scientists have found the answer? ,M: This is a difficult question. The truth is that we have no idea. We currently don't have a way of testing it. But some scientists will come up with a way in the future. I have faith in it. ,F: The last question is from our readers. Do you believe there is other life in different parts of the universe? ,M: There are so many planets in the universe. Life may exist on other planets, but will we ever find or research them? I think that's very unlikely.
(A) F: Why do you think it is easy to find life elsewhere, since you are my best teacher in school. (B) F: Since you are a scientist, why do you think it is impossible to find life elsewhere? (C) F: I also think it is exciting to find life elsewhere, let us go to school and tell our teachers. (D) F: I didn’t hear you. Please could you tell me again?

Ex Output:

D