# Project 2: ROT13 Cipher

# define the alphabet as one long string
alphabet = "xxxxxxx...."

# get user input, store it as a string
secret_code = xxxxxx
# convert to lower case
secret_code.xxxxxxx()
print(f"Original text: {secret_code}")

#initialize empty output string
output = ""
#for each character in user input
for xxxxx in xxxxxxxxxx:
    # get the position of each letter in the alphabet
    index = xxxxxxxxxxxxxx
    # if position not found
    if xxxxxxxxxxx:
        # don't translate, write directly to output
        output += xxxxxxxxx
    # otherwise
    else:
        # shift the character by 13, according to alphabet string
        index += xxxxxxx
        # deal appropriately with remainder. If using modulo, this
        # will do nothing if index is already less than 26
        index = xxxxxxxxx
        # write the output
        output += xxxxxxxxxxx

# print new string (the encrypted message)
# It should work in reverse!
print(output)