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: Gosh, we've been waiting for ages? What's the matter? ,M: Who knows? It always leaves on time more or less. But in the middle of winter, you have to expect the delay here sometimes. In fact, the trains also sometimes get delayed by snow on the lines or the planes by fog on the runway. Actually, it's probably rain that's holding up things for us right now.
(A) F: Yes, the rain may be the reason that the trains get delayed. (B) F: I am afraid I did not quite catch what you were saying. Please repeat it. (C) F: It's probably flog that's holding up things for us right now. (D) F: The weather forecast says the rain has stopped.

Ex Output:
A


Ex Input:
M: Mother, can you buy me a copy of this month's sunrise magazine? There's an article in it about how to care for fish. ,F: Sure. I'll get one for you this afternoon when I go to get a new teapot.
(A) M: Thanks. I just need a fashion magazine. (B) M: Thanks. I just need a magazine. (C) M: I am afraid I did not quite catch what you were saying. Please repeat it. (D) M: Could you please bring me a teapot?

Ex Output:
B


Ex Input:
F: I remember that you taught in a school when you were in Beijing. ,M: Yes, that's right. I was a teacher at No.15 Middle School. ,F: What do you do now? ,M: I do the same thing in Shanghai now.
(A) F: So you are still a teacher in Shanghai, but you were in Beijing. (B) F: You mean you are a student in a middle school. I remember that you studied in a school when you were in Beijing. (C) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (D) F: Being a teacher in Shanghai is a good choice. So you were teaching at No.50 Middle School.

Ex Output:

A