Which letter is last? From 22FF48, it goes to 49, 4A, 4B, 4C. Which is the last letter?
It is not a letter - it is hexamal digit
A = 10
B = 11
C = 12
D = 13
E = 14
F = 15
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler