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: Ella, what languages do you speak? ,F: As you know Korean is my first language. I also speak English and Chinese. How about you? What languages do you speak? ,M: English, German and French. While I was studying in Europe, I used French in German all the time. Now, my French is not so good but I do keep my German up.
(A) F: My mother tongue is Korean, but I can't speak any other language. (B) F: I’m sorry, I don’t understand. Could you say it again? (C) F: We can both speak English. English is my mother tongue. (D) F: My native language is Chinese, but I can't speak English.

Ex Output:
A


Ex Input:
M: Hello, Clark Cycle here. How can I help you? ,F: Oh, hello. I saw your ad in the local paper and I'm wondering what kinds of bikes you have, and what your prices are like? ,M: Well, we hire out 3 main types of machine, electric touring and mountain bikes. Are you likely to be riding off-road, do you think? ,F: No, I'll probably be sticking to roads. So, we're touring bike would be best. ,M: Right, well the rate will be 50 pounds for a week or 14 pounds per day. ,F: So it's a lot cheaper to rent by the week. Is there anything else I'd have to pay? ,M: Well, for another 5 pounds, we can supply lightweight bags. There is no charge for things like a pump or for a lock. It's a good strong one, just make sure you don't lose the key.
(A) F: Yeah, it's not a good strong one and cannot make sure I don't lose the key. And you mean the lock needs extra charge, right? (B) F: Really? For another 4 pounds, you can supply lightweight bags for me? So, the bag needs extra charge? (C) F: For another 5 pounds, you can supply lightweight bags for me? So, the bag needs extra charge? (D) F: I’m sorry, I didn’t catch that. Would you mind speaking more slowly?

Ex Output:
C


Ex Input:
F: Good morning, Northwind Airways. May I help you? ,M: Yes, do you have any afternoon flights to Shanghai on July seventh? ,F: One moment please. Yes, there is a flight at 12:45 PM and one at 4:40 PM. ,M: Either of those would be fine. Can you tell me how much a return flight would cost? I'll be returning on July twenty-first. ,F: Economy, business, or first class? ,M: Economy, please. ,F: OK, that will be $500. Which afternoon flight would you like to take on July seventh? ,M: The 441.
(A) F: No problem. A first class for your return flight, 500 dollars. (B) F: I've booked business class for your return flight on the 28th. (C) F: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (D) F: Economy class for flights to and from Shanghai. $500 in total.

Ex Output:

C