Ответ:
Kostya: Hi.
Misha: Hi
Kostya: Today we listened to healthy habits in our lessons.
Misha: I've been through it, too. I learned a lot of useful things. For example, it is necessary to eat properly, exercise and eat vitamins.
Kostya: as well as ventilate the room and not sit for a long time at the computer.
Misha: And be sure to wash and wash!