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: Hey, Jenny, what's the matter? ,F: I was just online in a chat room with three Germans. They used a lot of idioms on purpose and I didn't understand, so I asked them what they meant. Then they started to ignore me and after a while I started to feel stupid. ,M: Oh, you shouldn't. Your German is really good. ,F: But it seems they were using their German ability to have fun with each other. They didn't really want to include me. ,M: Well, some people are like that. That's all. You can't let them bother you. One nice thing about chat room is that you can leave and go to another one.
(A) F: I agree with you. The advantage of the chat room is that you can make more friends. But you can't enter or leave freely. (B) F: I agree with you. The advantage of the chat room is that you can express yourself freely. But you can't enter or leave freely. (C) F: I agree with you. The disadvantage of the chat room is that you can enter and leave freely. (D) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that?

Ex Output:
D


Ex Input:
M: Hi, Victoria. It's Eric from the clinic. I know you're not scheduled to work today. But do you think you can come in? We're getting very busy over here. ,F: I'm afraid I can't, Eric. I'm presenting at the patient care workshop this morning. ,M: Oh, I didn't realize you were a presenter. Well, good luck with that. I'm sure you'll do great.
(A) F: I’m sorry, I don’t understand. Could you say it again? (B) F: Thank you. I have been busy at the patient care workshop the whole morning and it's exhausting. (C) F: Thank you. I have been waiting the doctor's appointment all morning, so I really don't have any time. (D) F: Thank you. I have been in a meeting with Greg all morning, so I really don't have time to help you.

Ex Output:

B