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:
M: Is there a city where it's always warm? ,F: Yes, there are many cities where it's almost always warm. San Diego for example. ,M: Are there any other cities where it's always hot? ,F: Yes, there are quite a few. Most of the cities in the southern part of the United States are hot all year.
(A) M: I see. Most cities in the western part of China are always hot. (B) M: I know that cities in the southern part of China is always hot. (C) M: Excuse me, could you repeat the question? (D) M: It seems that most cities in the southern part are hot all year around.

Ex Output:
D


Ex Input:
M: Can we go somewhere and talk about your experience abroad? It's noisy in the cafe. ,F: Shall we go to the tea house upstairs? ,M: But I need to get some fresh air. ,F: Well, there's a park nearby. It's usually not crowded at this time of day.
(A) M: I’m sorry, I don’t understand. Could you say it again? (B) M: Great, the air in the park is comfortable (C) M: Ok, then go to the tea house downstairs you have mentioned. (D) M: Ok, I'd like to share with you my experience abroad in the cafe.

Ex Output:
B


Ex Input:
M: I'm in front of the people's hospital now. How do I get to the green hotel from here? ,F: Cross the street and walk straight along, you'll see a post office in about 10 minutes. ,M: Is the hotel near the post office? ,F: Yes, it's only a 5-minute walk from there to the hotel.
(A) M: Thank you, once I get to the hotel, I'll call you back. (B) M: But where is the hospital? I want to go there. (C) M: So, it will take me less than 10 minutes to get to the hotel. (D) M: I didn’t hear you. Please could you tell me again?

Ex Output:

A