Press different keys and the cat will say them. If you look inside you'll see that the code is tiny. The only reason that the key you last pressed is still said is that there is no 'stop saying []' block.
All code by @triskedekaphobia. I made this in like 5 minutes, but it is really useful. If there is a character you need checking but it is not in the list, just add it to the list. You don't have to change anything in the code. Feel free to give credit!