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: F: The book is so interesting. ,M: If you like, I can lend it to you. I borrowed it from the library one week ago. And there are still 2 weeks left.
(A) F: It sounds great that you can keep the book for three weeks. (B) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (C) F: It's too short that you can only keep the book for one week. (D) F: It sounds great that you can keep the table lamp for three weeks.

Output: A


Input: Consider Input: M: Nice to see you marry, come in, please. ,F: Thank you Tom, but I am afraid not now, I come only to return the book borrowed from you. ,M: Wonderful I've been waiting for you a long time and longing to know, what you think of it? ,F: It is very interesting and I've learned a lot from it. ,M: Well, so it is with me. ,F: Oh sorry, I can't go on talking about it with you any longer. ,M: It doesn't matter, better stay here for another 10 minutes. ,F: No, I'll go and buy some food in the shop, and I have to say goodbye to you.
(A) M: So, you don't have to say goodbye to me and you will talk with me? (B) M: Okay, I see. You will go and buy some food next. (C) M: Really? You mean you can stay here for another 10 minutes and you will buy some food next? (D) M: I didn’t hear you. Please could you tell me again?


Output: B