Mappings for the alphabet

If you wish to map letters of the alphabet, you might want to use one of the following mappings:

A 1
B 2
C 3
D 4
E 5
F 6
G 7
H 8
I 9
J 10
K 11
L 12
M 13
N 14
O 15
P 16
Q 17
R 18
S 19
T 20
U 21
V 22
W 23
X 24
Y 25
Z 26

or

A -1
B -2
C -3
D -4
E -5
F -6
G -7
H -8
I -9
J -10
K -11
L -12
M -13
N -14
O -15
P -16
Q -17
R -18
S -19
T -20
U -21
V -22
W -23
X -24
Y -25
Z -26