Detective's Codes and Ciphers Cryptography

HITMAN CIPHER

If A is A then N is N.
A~A
B~Z
C~Y
D~X
E~W
F~V
G~U
H~T
I~S
J~R
K~Q
L~P
M~O
N~N
Example
Ciphertext: TSHOAN
Plaintext: HITMAN