When you create an online project in scratch, you can't use letters the conventional way, so you must create encoders and decoders for it to work right. I originally used a very long one by @Gold_Creator but then went through the discussion forums and found a simpler way and tried it, and it worked. This can work with up to 899 characters in the list, so you have some to work with. click space to see it run.
Please credit me if you use this
