A(a+b) 2c(c+b+3) 2x^2(3x-y-4) -4f^3(-6+b+f-f^2)

S3: which kind of sports is your favourite?
S1: Oh, I lobe hockey. I know everything about it. It's a winter sport, but simetimes people play it even when it's summer or autumn.
S3: and you, S2?
S2: well, I hate hockey. It's very dangerous to play in it, though sometimes games can be quite interesting. I love swimming. It's great to swim and relax in the same time. I love this feeling of relaxing and training [in the same time].
S1: oh, and you, S3? Which kind of sports do you prefer?
S3: Frankly speaking, I like sport(s) but I didn't really know what I should choose. Can you help with that choice?
S1: Yes, of course. Let's talk about it a bit later.
S3+S2: Ok. See you then(,)guys. Bye.