How does it work:

Mobs have hit box, this machine use water stream and a couple of blocs to make height limiter to sort them.

You can:
- Sort mobs: skeletons, zombies, witches and creeper

To use it
1) Bring mobs into the machine with rails
1) Take mobs with rails

How to build it on survival:
https://youtu.be/KnFl6uXsJ5Q

Warning:
You need to bring them with rails, to not break the tempo in the machine. If mobs push each other, the sorting can't be done.

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Made by me.
Thanks to credit me if you make it a video, claim this machine as yours is totally forbidden.