Write a program to decode the scheme presented in Problem 18. Test the Program by using files generated by Problem 18.
Reference: Problem 18.
Developing secret codes has interested people for centuries. A simple coding scheme can be developed by replacing each character in a text file by another character that is a fixed number of positions away in the collating sequence. For example, if each character is replaced by the character that is two characters to its right in the alphabet, then the letter a is replaced by the letter c, the letter b is replaced by the letter d and so on. Write a program that reads the text in a file and then generates a new file that contains the coded text using this scheme. Change only the alphanumeric characters.
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