Why this code show no output?

Question

This code is design for remove all special character from string. example: @52:c/'jsi output: 52cjsi . Anyone help me solve this problem of this code. thank you in advance
https://code.sololearn.com/cS6OGwu0Wt2r/?ref=app

Answer 1

Exchange and against or, then you get *some* output.

(Letter can't be alnum AND space.)

Answer 2

HonFu Got it ! Thanks Kung Fu Master ! Haha Jk