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: John, when was Tom born? ,M: He was born on May seventh 1982. He is 4 years older than I am, but our birthdays are on the same day.
(A) F: Oh, you mean you were born in 1982 and you are 4 years older than Tom? (B) F: I can't believe that you were born in 1986 and you are 4 years older than Tom. (C) F: I’m sorry, I don’t understand. Could you say it again? (D) F: Since you are 4 years older than Tom, so you must have been born in 1978.

Ex Output:
C


Ex Input:
F: Hello, this is the International Student Office. This is Leah. How may I help you? ,M: This is Nathaniel Brown, from English Department. I'd like to speak to Miss Collins about my accommodation situation. ,F: Well, I'm sorry. She is out for lunch at the moment. Can I take a message?
(A) M: No thank you. I will wait for her to finish the meeting. (B) M: Sure. I want to have a talk with her about my accommodation situation. (C) M: Sure. I want to have a talk with her about my department. (D) M: Excuse me, could you repeat the question?

Ex Output:
B


Ex Input:
F: Hi John, how is your summer vacation? ,M: Well, I went to Sanya and spent a whole week there. It can't be better. What about you? ,F: My family went to climb Mount Hua and everyone was worn out upon reaching the top.
(A) M: I didn’t hear you. Please could you tell me again? (B) M: Wow, that's great! You know, I went to Sanya and spent two weeks there and I think my vacation is too tiring. (C) M: Really?  No one was worn out upon reaching the top? That's great, and I also have a wonderful vacation. (D) M: OK, I see. It is a good vacation. And I think my vacation is also very wonderful.

Ex Output:

D