How to count the number of active sessions?

Question

linux

It is necessary to count the number of active user sessions whose names end with the letters "r,x,z". Tell me please

Answer 1

w |tail -n +3|awk '{print $1}'|grep 'r$\|x$\|z$'|wc -l

(that's just what you will learn by copy-pasting the teacher's ready-made answers?)