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: Good evening, sir is there anything wrong? ,M: I'm afraid there is, and the service here has been terrible. We had to wait 40 minutes for the soup and then it was stone cold.
(A) F: Sorry. I will serve the soup for you right away. (B) F: I will take a look for you to see why the play hasn't started in the theater. (C) F: Excuse me, could you repeat the question? (D) F: I don't know why the bus hasn't come yet.

Ex Output:
A


Ex Input:
F: Can I help you find something, sir? ,M: Yes, I need a strong lock for my bike. I am a photographer and I often have to leave my bike for long periods of time while I go take pictures. I'm hoping to spend less than $50 if possible.
(A) F: Why do you need a bike? (B) F: I’m sorry, I didn’t understand. Could you repeat a little louder, please? (C) F: You mean your lock is broken. It needs repairing, right? (D) F: What kind of lock do you like?

Ex Output:
D


Ex Input:
M: Hello, do you have the best of Mozart? ,F: I'm sorry. We've just sold out, but we can order one for you. If you give us your number, we'll call you when the CD arrives.
(A) M: Thank you, you are really helpful. (B) M: I am really sorry, I did not catch that. Would you slow down, please? (C) M: It's so generous of you to give me the CD for free. (D) M: It will be more helpful if you can tell me when will the Beethoven CD arrives approximately.

Ex Output:

A