Хорошая задача. Решил ее через срезы строк. Нужно учесть, что разница может быть равной нулю.

For example, if your string contains both 1 and 0, and you replace 1 with I, that might create a situation where another part of the string (e.g., something containing 10) is now altered in an unexpected way when 0 is replaced with O.

What does unstable mean in this context?

very good

It works perfectly for everyone. Not sure where you're getting an error.

i cant tell you how many times i thought about Re but ended up not using it haha beautiful

Approved by someone

because of this code i now understand what this codes do unlike from the first one it is readable for beginners like me

yess

brackets denote choosing between a number of characters in regex. in this case, picking one of "a", "e", "i", "o", "u", "A", "E", "I", "O", or "U".

THIS METHORD IS WRONG!
ERROR

"Baby don't hurt me."