Two signals s(n) and v(n) are related through the following difference equations s(n) + ais(n - 1)

Question:

Two signals s(n) and v(n) are related through the following difference equations
s(n) + ais(n - 1) + . . . . + aN s(n - N) = b0v(n).
Design the block diagram realization of:
(a) The system that generates s(n) when exited by v(n).
(b) The system that generates v(n) when exited by s(n).