^^ what johnny said

Think it should be log(n)

Description is purely maid, and i can't access list items by indexes

No, title can be an empty string. Print your inputs.

One of your problems is that replace doesn't work as you think, you should read its documentation first.

And you should use the markdown syntax to format your code and make it readable (three backticks ` before and after your code will be a good start).

Why does the if statement not break the loop and return s when it encounters first alphanumeric char?

for char in s[::-1]:
if char.isalpha():
return s
elif char == "!":
s = s.replace(char,"")
return s

Didn't know we could specify another value when typecasting to int if the first one raises an error. Very cool trick!