I live in the master bedroom on the first floor, did I get into it through the sewer?

On the first floor, you can enter through a window or a door. Snakes won't get into the sewers.

Living on the first floor, there is a snake in the master bedroom, whether it came in through the sewer, not necessarily, it may have climbed in through the window, or it may have come in through the crack in the door.

No, the inner wall of the sewer pipe is relatively smooth, and the snake's crawling scales can't climb in the sewer pipe, and secondly, the 6th floor is 18 meters high, and the crawling ability of ordinary snakes will not be so strong.

In the master bedroom on the first floor, there's a snake coming in, and it's possible that the snake came in through the sewer, or it could come in through the entrance door.

99% of the time it may have climbed up from the sewer, because the snake is very powerful, and he can climb up from the pipe, and he is very good at climbing this thing, and he can climb up in slippery places. It could have been from those sewers, or it could have been from those trees and into the windows, and then it could have climbed in. Preventing these things can be done with a little less sulfur at those water outlets.

Sprinkle a little brimstone where he is going to crawl in.

Not necessarily, snakes are very hidden.

Not necessarily, maybe a window or a door. As long as there is a seam, there is suspicion.