Answer: Secret Code #7

The secret message says:

TRY AGAIN

The shift was 1.

Letter by letter

Secret letter	B	H	J	O	S	U	Z
Real letter	A	G	I	N	R	T	Y

Decode it with Python

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

secret = "USZ BHBJO"
shift = 1
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:

TRY AGAIN