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: Excuse me, is there anyone sitting here? ,F: Oh, no, please. ,M: Ah, thanks. Um, it's a long flight. ,F: Yeah, 11 hours.
(A) M: The is a long journey on bus. (B) M: The train we take lasted eleven hours. (C) M: I'm sorry, I don't understand. Could you say it again? (D) M: It's really a long flight which has 11 hours.

Ex Output:
D

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:
M: Hi, Jane, nice to see you again. I heard that you went to the US during the vacation. ,F: Yes, I went to New York to attend a summer course in English. ,M: How lucky you are! How long did you stay there? ,F: About 50 days. I went there on July the fifth and came back on August the twenty-fifth. ,M: Where did you live in New York? ,F: I lived with an American family, the Whites. They're very kind people. Shortly after I arrived, we became good friends. And living in their house, I could speak English with them everyday.
(A) M: You like staying with the whites because they treat you like their own daughter, so you stayed there for about 40 days, right? (B) M: So you like to stay with the whites because you can speak English with them every day? (C) M: Excuse me, could you repeat the question? (D) M: So you like to stay with the whites because you can speak English with them every day. That's why you stayed there for about 40 days, isn't it?

Ex Output:
B