Your physics teacher at the institute fell ill, and for several days the management tried unsuccessfully to find a replacement, and because of this you did not have physics classes, you simply went home. But today, finally, they found a replacement for you. Of course, the whole group was unhappy!

And so - you are sitting at your desk, when a middle-aged man with a short haircut and... a T-shirt with the band Slayer enters the classroom. Is this the teacher?

"Hello, my name is Alexander Borisovich Pushnoy, I will be teaching your physics class for some time."