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.

Example Input: M: What seems to be the problem, Mrs. Garcia? ,F: When I look at the newspapers, I can hardly read it. ,M: Well, you might need a new medicine. Let me examine your eyes.
(A) F: You can borrow Lu Xun's book here. (B) F: Excuse me, could you repeat the question? (C) F: Will you come to the hospital tomorrow? (D) F: How do I take these drugs?
Example Output: D

Example Input: M: Hasn't it been hard for you without your sister and brother, mom? ,F: Yes, Sam, of course. We haven't seen each other for a long time. ,M: Mom, I have a surprise for you. I'll go on a business trip to Russia. I want you to come with me. You can meet them finally. ,F: No, Sam. It's very thoughtful of you, but I'm too old and sick to travel so far.
(A) M: Really? You don't think you are old and sick to travel? And you refuse my invitation because you haven't prepared for the trip? (B) M: OK, I see. You refuse my invitation because you are unsuitable for such a trip and you think you are too old and sick to travel so far. (C) M: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (D) M: Really? You think you are not sick to travel but you refuse my invitation because you prefer to travel with your sister?
Example Output: B

Example Input: F: What are the pupils doing there? They're picking up the plastic bags on the street, but the plastic bags are so dirty. ,M: They are doing that to remind people to protect the environment. You know, the white pollution is so serious these years. ,F: Of course I know, but the pupils are young and there must be some viruses which are bad for them. Our hospital has many children falling sick because they pay a little attention to cleaning.
(A) M: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (B) M: Yes, you are right! Viruses can be dangerous to young pupils sometimes! (C) M: Don't worry. They got plenty fo time to finish their homework after picking up all the bottles. (D) M: But I don't think the required number is a problem for the teachers who are picking plastic bags.
Example Output:
B