Did you try this? This won't work. What you did will make inputting a 4 yield a 5, but it won't change the behaviour of outputting a 4. (And it will only turn

Did you try this? This won't work. What you did will make inputting a 4 yield a 5, but it won't change the behaviour of outputting a 4. (And it will only turn an input 4 into a 5 if your interpreter checks for words before checking for numbers which is not universally the case).