Hint #3

Cipher: M = A then flip the entire sequence…
A = N
B = M
C = L
D = K
E = J
F = I
G = H
H = G
I = F
J = E
K = D
L = C
M = B
N = A
O = Z
P = Y
Q = X
R = W
S = V
T = U
V = S
W = R
X = Q
Y = P
Z = O