At the start of the Pig Latin exercise, we are asked to print the original input string if the input is not empty and is made up of alpha characters.
if len(original) > 0 and original.isalpha(): print original
This is likely done so to provide a simple example of writing an 'if' statement in a program.
By the end of the exercise, this segment of the code is left untouched, ie. we are still printing out the original input instead of the altered input. It feels like there should be some indication that we ought to change the printed statement, ie to
if len(original) > 0 and original.isalpha(): print new_word