Look at the book of Mary Shelley ${?}^1,$ named Frankenstein ${?}^2,$ in the file frankenstein$\_$encrypted.txt$.$ You can see that the given text is not readable because the text is encrypted using the Caeser cipher algorithm ${?}^3.$ You must write a Python code that decrypts and writes the decrypted text into the frankenstein$\_$decrypted.txt file.

Hints

Your source code should be in the same directory as the txt files you are working on$.$

You can search the Web for information on reading and writing files in Python.