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.

Example Input: F: Is that you, Tom? Long time no see. What have you been doing all these years? ,M: Hi Lucy. I haven't seen you in a million years. I actually worked abroad for a few months and I've just returned from Canada. How are things with you? ,F: Everything is fine except that we have been missing you. ,M: We really need to get together sometime.
(A) F: How many years have you worked abroad? (B) F: Definitely! Let's make an appointment. (C) F: I'm sorry, I don't understand. Could you say it again? (D) F: Definitely! Let's make an appointment after I return from Canada.
Example Output: B

Example Input: M: Welcome back to your student union radio station. I'm with Catherine, who just successfully climbed the Great Mountain, Mont Blanc. Actually, she once did. The same climb in 2007. Catherine, was it easier the second time around? ,F: In many ways. They were totally different experiences. The first time I went as part of an organized group. We took 4 days to reach the top. This year, I decided to go alone with just one overnight stop, actually you're never really alone. It's all been crowded up there. The first climb, was quite difficult is the weather was very changeable, and we found ourselves climbing in very cold windy conditions. The weather this time was wonderful. Plus. I spent a few days before in chamonix and got myself more used to the height. If it's certainly made it easier, you can also achieve the same thing by climbing some of the smaller mountains first.
(A) M: You are used to climbing mountains in a group, and you never climb alone. (B) M: I'm sorry, I didn't understand. Could you repeat a little louder, please? (C) M: You are so brave that you successfully climbed the Mont Blanc on your own. (D) M: You climb mountains with a guide? No wonder you just took 2 days to reach the top.
Example Output: C

Example Input: F: It's a terrible day, isn't it? ,M: Yes, it is. This is why our flight was delayed for 2 hours. My parents should be worried about me. They are waiting for me at London airport. ,F: Where did you come from? ,M: Beijing. I was there for a 2 weeks' conference on space technology. ,F: How interesting! I was there for tour. You see, I usually have a tour twice or 3 times a year. ,M: Really? Which places did you visit in China? ,F: Apart from Beijing, we went to Nanjing, Shanghai, Xi'an, Hangzhou, and Guangzhou.
(A) M: So, you visited six cities in China? You went to Beijing, Nanjing, Shanghai, Xi'an, Hangzhou, and Guangzhou? (B) M: Really? You visited five cities in China but you didn't go to Nanjing, Shanghai, Xi'an, or Hangzhou? (C) M: So, you mean you usually have a tour twice or 3 times a month and you visited four cities in China? (D) M: I'm sorry, I didn't understand. Could you repeat a little louder, please?
Example Output:
A