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: F: I hope you can come to the party on Saturday. ,M: I didn't know I was invited. ,F: Sure you are, everyone in our office is invited.
(A) M: Thank you, teacher. I am sure our classmates will attend the lecture on Saturday. (B) M: I’m sorry, I didn’t understand. Could you repeat a little louder, please? (C) M: Why you didn't invite our parents to the concert on Saturday? (D) M: Oh, great. So I will meet our workmates there.

Output: D


Input: Consider Input: F: Facebook just reported that everyone in the world is only separated by an average number of 3.5 people. ,M: Wow, that doesn't seem possible! I thought the number was supposed to be 6. ,F: That's what scientists originally thought. I think we're all connected even more than Facebook reported actually. The report only included connections between those with a Facebook account.
(A) M: Facebook just reported that everyone in the world is only separated by an average number of 7 people but they don't like to share their lives. (B) M: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (C) M: You think people in the world are closely connected. (D) M: Facebook just reported that everyone in the world is only separated by an average number of 7 people because scientists don't understand social connection.

Output: C


Input: Consider Input: F: Excuse me. You are Mr. Green from Manchester, aren't you? ,M: Yes, I'm glad you recognized me. ,F: A man with white hair and a beard, isn't that how you describe yourself in the telex? So it's easy to spot you in any crowd. Let me introduce myself. I am Tan Ling, source manager of Yellow River Import and Export Corporation. How do you do? ,M: How do you do? ,F: Well, Mr. Green, do you have any unaccompanied luggage? ,M: No. I always travel with this bag or with small suitcase only.
(A) F: It is interesting that you will take a bag or a suitcase to school. You must be a good teacher. (B) F: Good for you. Both a bag and a small suitcase are convenient for you. You are so smart. (C) F: When you move house, you will need not only a bag but also an unaccompanied luggage. (D) F: I am afraid I did not quite catch what you were saying. Please repeat it.


Output: B