KenKen example

$ cat 6.in
AABBBC
ADEFGC
HDEFGI
HJ4KKI
LJMNOI
LMMNO2
A * 40
B + 6
C - 5
D / 3
E + 8
F - 2
G - 1
H * 6
I + 12
J - 4
K - 3
L * 12
M + 11
N - 4
O + 7
$ ./kenken-exe < 6.in
541326
265431
123645
614253
352164
436512