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:
F: Besides the medicine you gave me, do you think I should have some chicken soup? ,M: I'm afraid it can only make your stomachache worse.
(A) F: I will buy a bag of chicken soup then. Where is the cashier of the department store? (B) F: I will order one chicken soup then. Your soup is always so delicious. (C) F: I am really sorry, I did not catch that. Would you slow down, please? (D) F: Ok doctor, I will have some chicken soup and medicine then.

Ex Output:
C


Ex Input:
M: Hi, Mary. Very glad to see you here. ,F: Hi, Robert. I'm glad to see you here, too. ,M: Your bike is so beautiful, where was it made? ,F: In China.
(A) M: Dear, which do you want to have for lunch? (B) M: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (C) M: You are always my best friend. (D) M: Boss, I have finished my work.

Ex Output:

C