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: Nice to see you again, Mike. How was your trip to China? ,M: It was great. I flew to Beijing with my wife last month and I stayed there for 3 days. There were so many things to see and so many places of interest to visit in Beijing that we really couldn't decide whether to leave or stay. ,F: Have you visited other places in China? ,M: Yes, then we visited Shanghai and Nanjing, each city for 2 days. Finally we paid a visit to Guilin, where we spent 3 days. They were so beautiful that we were deeply impressed by these cities.
(A) F: Two days in Shanghai and Nanjing respectively didn't sound enough for me. (B) F: I'm sorry, I didn't understand. Could you repeat a little louder, please? (C) F: Three days in each city, including Nanjing and Shanghai? Sounds so great. (D) F: What did you do during the four days in Nanjing? I skipped the city last time.

Ex Output:
A

Ex Input:
M: Talking about the future. I think there will be huge changes in the way people use cars. Laws will be made about what kind of car you can own and when you can use it. ,F: Maybe they'll just be too many of them on the roads. The air will be so seriously polluted that nobody will be able to breathe normally. ,M: Exactly. People will have to rely on trains.
(A) F: I am afraid I did not quite catch what you were saying. Please repeat it. (B) F: I see. You believe that trains will change a lot while cars remain the same, so people would choose trains more often. (C) F: Why do you think that cars will be the most common kind of transportation many years later? (D) F: Oh, why you think people will rely on trains in the future?

Ex Output:
D

Ex Input:
M: I'm here with Margaret Seabrook, the CEO of creative toys. In today's show, we're going to discuss the hottest new toy of two thousand seventeen, the Super Spinner. Margaret, welcome. ,F: Thank you, Brian. It's great to be here. ,M: OK, so tell us about this new toy. ,F: Well. It's similar to a relaxation ball in its function, but it's useful for anyone who has problems focusing. ,M: So how does it work? ,F: It's about the size of a cookie and it has 3 small round parts that can move in any direction. Basically, you just hold it in between your thumb and middle finger and spin it. That's it. ,M: That's it? ,F: Yeah, it's very popular. Not only with children, but with adults as well.
(A) F: I'm sorry, I didn't catch that. Would you mind speaking more slowly? (B) F: So, it has 3 big round parts that can move in any direction and the toy is popular with teenagers? (C) F: So, it's different to a relaxation ball in its function and the toy is popular with all age groups? (D) F: So, it's popular with all age groups, not only with children, but with adults as well?

Ex Output:
D