The output of each instance consists of a line of numbers. The first number x is the total number of cells that are exactly c cells away from cell b, and the rest of the x numbers are the cell numbers, in increasing order and separated by a space, that are exactly c cells away from cell b.
For example, for a size-5 beehive (Figure 
right), cell
is exactly 3 cells away from cell 
(
) but cell 
is not
exactly 3 cells away from cell : although one can do 
that looks like 3
cells away, one can also do 
which is actually 2 cells away.