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: Was that the telephone ringing? ,F: I didn't hear anything. ,M: I thought I heard it ring 2 or 3 times. ,F: Sometimes when the windows are open, you can hear the neighbor's phone. ,M: Well, I'm expecting an important phone call and I don't want to miss it.
(A) F: Relax. You're so nervous. You already missed the important phone call. Maybe you should call them back. (B) F: I’m sorry, I didn’t understand. Could you repeat a little louder, please? (C) F: Relax. You're so calm. You should be nervous in case you miss the important phone call. (D) F: Relax. You're so nervous. You should be more calm to wait for the important phone call.

Ex Output:
D


Ex Input:
M: We'd like 2 rooms, a small room and a large room, both facing the garden. ,F: Very good sir, the small room is $20 a night, and the large room is $30 a night.
(A) M: So I have to pay $50 a night. (B) M: I’m sorry, I didn’t understand. Could you repeat a little louder, please? (C) M: I only need a large room, so I need to pay $20 a night, right? (D) M: I only need a small room, but I need to pay $50 a night, right?

Ex Output:
A


Ex Input:
F: How are your Chinese lessons going? ,M: Oh, I'm learning very slowly. I think Chinese is more difficult than English and French.
(A) F: Really. I thought it is more challenging for you to learn English, rather than Chinese. (B) F: It's normal. Chinese is more difficult. But you are learning very quickly. (C) F: That's true. Chinese is more challenging. (D) F: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that?

Ex Output:

C