Today’s exercise solves a homework problem for some lucky reader:

Given an input string that contains both alphabetic characters and non-alphabetic characters, reverse the alphabetic characters while leaving the non-alphabetic characters in place. For instance, given the input string a!b3c, return the output string c!b3a, where the non-alphabetic characters ! and 3 are in their original positions.

Your task is to write a program that reverses a string while leaving non-alphabetic characters in place. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.


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