Hey @Bazz2498x!
If you are just wanting to replace letters, it may make more sense to use the replace node or replace inline node. This will streamline that process so instead of creating an an array like displayed above, it will simply loop through the string and replace the letters you are looking for. The advantage here is that you can also choose to do words, phrases, etc. as what you want to replace. Check out this example using a string where all the A’s will be replaced with “-”:
Doing it this way also has the advantage of letting you preserve your original string, so you can re-remove characters the player does not know if they learn a new one.
I hope the above is the solution you are looking for.