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: F: How long have you been living in this city, Jack? ,M: Let me see. I came to this city when I was 23 years old. So 5 years now. ,F: Do you like living in the big city? ,M: Not so much. Air pollution has become such a big problem here now.
(A) F: I agree with you. Heavy traffic is a serious problem. (B) F: I agree with you. Air pollution is not a serious problem. (C) F: I am afraid I did not quite catch what you were saying. Please repeat it. (D) F: I agree with you. Air pollution should be paid more attention to.
Example Output: D

Example Input: M: Lucy, I'm terribly sorry to hear your mother was seriously ill. ,F: Don't worry so much, grampa. She is much better now.
(A) M: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (B) M: Is she still terribly ill? Sad for her. (C) M: After my operation, your mother is better now. Don't worry. (D) M: Good to hear that your mother has turned much better.
Example Output: D

Example Input: M: You look rather pale. Are you feeling well? ,F: Not very. I was sick most of the night. I didn't sleep very well. ,M: What seems to be the matter? Is it the flu? ,F: No, I think it was something I ate. We ate at that new restaurant last night and I must have eaten something that didn't agree with me.
(A) M: You're right. I also think you probably ate something bad. (B) M: You said you felt better. Why don't you agree with me? (C) M: You said you thought you might have eaten something bad, but that restaurant is not new. (D) M: I am afraid I did not quite catch what you were saying. Please repeat it.
Example Output:
A