Write a Python program to encrypt a text file by adding 5 to every byte in the file, and decrypting by subtracting 5 from each byte. Program prompts user to enter an input and output file name and save the file to the output file.

xxlab13-1, xxlab13-2: Write a program to encrypt a text file by adding 3 to every byte in the file. Write a second program which would read in the encrypted file and decrypt it by subtracting 3 from each byte. The program prompts the user to enter an input filename and an output filename and save the encrypted (or decrypted) file to the output file