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: When does your flight take off, Mary? ,F: At 3:15 PM. There are just 2 hours left so I'm leaving now.
(A) M: I’m sorry, I don’t understand. Could you say it again? (B) M: I didn't realize it is 1:15 p.m. now. (C) M: It's 2:15 p.m. now. Your flight will take off in two hours. (D) M: It's 3:15 p.m. now. Your flight has taken off, hasn't it?

Ex Output:
B


Ex Input:
F: You seem to have caught a cold. ,M: I see. Should I have an injection or take some medicine? ,F: Neither. But you'd better drink more water every day. It will do you good.
(A) M: Excuse me, could you repeat the question? (B) M: Yeah. I should take some medicine. (C) M: Yeah. I should drink more water and go to the hospital then. (D) M: Yeah. I should drink more water.

Ex Output:
D


Ex Input:
M: Have you heard about Tim? He had an accident today and was taken to the emergency room at Xinhua Hospital. ,F: Really? Oh, I hope it's not too serious.
(A) M: Yes. Tim left Xinhua Hospital and went back home. (B) M: Excuse me, could you repeat the question? (C) M: Yes. Tim was taken to the emergency room. (D) M: Yes. He was seriously injured yesterday and he was in the hospital now.

Ex Output:

C