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.

Input: Consider Input: M: Talking about the future. I think there will be huge changes in the way people use cars. Laws will be made about what kind of car you can own and when you can use it. ,F: Maybe they'll just be too many of them on the roads. The air will be so seriously polluted that nobody will be able to breathe normally. ,M: Exactly. People will have to rely on trains.
(A) F: I am afraid I did not quite catch what you were saying. Please repeat it. (B) F: I see. You believe that trains will change a lot while cars remain the same, so people would choose trains more often. (C) F: Why do you think that cars will be the most common kind of transportation many years later? (D) F: Oh, why you think people will rely on trains in the future?

Output: D


Input: Consider Input: M: Have you ever taken History 231? ,F: Yeah, last term. ,M: Who was the professor? ,F: Professor Johnson. ,M: I have him this semester. What do you think of him? ,F: He's a terrible instructor and demands a lot, but fortunately we can get high scores easily in his class. ,M: What did you get? ,F: I got an A, but none of my test scores were that high. So I don't know how I got such a good score. ,M: Really? I was about to give it up, but after hearing your experience, I think I will continue to stay in the class. ,F: You will get a better grade than your test scores. ,M: Thanks for the information. I feel relieved now.
(A) F: You are welcome. Wish you well in the new class. (B) F: You are welcome. Just go and have a talk with Professor David. (C) F: No worries, stay and you will get a good score. (D) F: I’m sorry, I don’t understand. Could you say it again?

Output: C


Input: Consider Input: M: Lost and found. How can I help you? ,F: I'm ringing because I lost my bag yesterday. ,M: I see. Well, we received 8 bags yesterday. What color is it? ,F: It's black. ,M: Em, I've got 3 bags here. Can you give me some more information? ,F: It's quite large. I wear it over my shoulder. It's got a zip on the front and there's a pocket on the side for a mobile phone.
(A) M: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (B) M: Okay, I see. You mean you bag has a zip on the front, right? (C) M: So, you mean you don't wear it over your shoulder and it has a zip? (D) M: So, you mean your bag is red and it has a pocket on the front, right?


Output: B