Cockroaches in the Bathroom

Second person. There is a beetle in the bathroom. On the wall to the right of the sink, a cockroach half a finger long was lying there. You may be surprised in your heart, or you may be numb, but it is impossible to verify now. All you remember was that all you could think about was how to kill it without disturbing it. You wash the greasy feeling off your hands and shake off the excess water. Idea: What should I do if there are cockroaches in the bathroom?