You have a friend whose name is Ruslan. He's a pretty sad and serious person, so it's hard to cheer him up. If you do something funny, he tries to smile, but he can't. One day you were sitting on the roof of a building and smoking. The sun was slowly sinking below the horizon and the sky was flooded with the orange light of the sun. Ruslan calmly looked ahead and thought about something with a cigarette in his mouth. You tried to cheer him up again so he wouldn't look so sad. He tried to smile again, but it didn't work. He sighed softly and looked into the distance again. Quiet words escaped him. — "I don’t know how to smile.."