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: So how's your new job going, David? ,M: It's going really well. I started 2 months ago and it's great. ,F: Which countries are you flying to? ,M: Mostly those in South America.
(A) F: I'm very happy that you're used to this job on the plane. I was a little worried when you first started a month ago. (B) F: So you do like your work on the plane, don't you? (C) F: Excuse me, could you repeat the question? (D) F: Does that mean the restaurant you work in South America?

Ex Output:
B


Ex Input:
M: Hello. This is the China Telephone Company. What can I do for you? ,F: Is this the Complaints Department? ,M: Yes, it is. ,F: I want to complain about the bill I received this month. I don't think I've made that many phone calls. Have their rates gone up? There must be a mistake in your billing.
(A) M: Why do you think the telephone bill was not accurate? How much is ti? (B) M: Yes, your telephone line was always busy. But you still got a low bill, that's strange. (C) M: Do you mean that the telephone call was not clear. As IT department, I'll help you to solve it. (D) M: I’m sorry, I didn’t understand. Could you repeat a little louder, please?

Ex Output:
A


Ex Input:
F: Ladies and gentlemen, we'll pay a visit to a cave tomorrow. ,M: What fun is it to visit the cave you mean? ,F: It's an uncommon cave. It's underground, wide and long and in the cave there's rocks of different shapes which looked like a lion, a tree, a bell or something else. ,M: What else can we do there besides seeing the rocks? ,F: There's a stream running through the cave. You can row boats there. ,M: How will we get there and will it take a long time? ,F: About 60 miles away from here. First, we get to the town nearest to the cave in a passenger car and then we take an about 15 minute walk. ,M: May I understand that the cave is in a place far from the town? ,F: Not really. Since the ground is not strong, it's impossible to build roads or railways. ,M: Are there any restaurants where we can stay for lunch and have a rest? ,F: There are some. They are mostly opened by the local people. So if you are not used to the local food, I'd suggest you take some food yourself. ,M: What else should we take? ,F: Oh, your question reminds me of one thing that I have to mention. Bring with you some clothes in case it is cold in the cave. Is everyone clear about that?
(A) M: Thank you for reminding me to bring some guns. We will drive 3 hours to the cave, during which guns are necessary. (B) M: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (C) M: It is true that we should bring some clothes. And our clothes may get wet while we are rowing boats in the cave. (D) M: Why should we bring some tools? It is just a long and narrow cave without stream. We can finish visiting is safely.

Ex Output:

C