Answer: Secret Code #4

The secret message says:

GREAT IDEA

The shift was 2.

Letter by letter

Secret letter	C	F	G	I	K	T	V
Real letter	A	D	E	G	I	R	T

Decode it with Python

This program does the decoding for you. Change the secret and the shift to crack other messages!

secret = "ITGCV KFGC"
shift = 2
message = ""

for letter in secret:
    if letter.isalpha():
        number = (ord(letter) - ord("A") - shift) % 26
        message = message + chr(number + ord("A"))
    else:
        message = message + letter

print(message)

When you run it, it prints:

GREAT IDEA