Missing character finding

A = 3.5, B = 4.5, C = 9.5, D = 3.5

A = 2.5, B = 1.5, C = 9.5, D = 4.5

A = 4.5, B = 5.5, C = 9.5, D = 2.5

A = 5.5, B = 6.5, C = 6.5, D = 8.5

D

N

P

T

D

K

Q

V

DXY

OAM

UGC

FMR

A

E

K

R

B

D

E

G

F

J

N

T

L

P

T

Y

C

G

N

W

A

G

M

P