If $$x^2 - y^2 + 2hxy + 2gx + 2fy + c = 0$$ is the locus of a point, which moves such that it is always equidistant from the lines $$x + 2y + 7 = 0$$ and $$2x - y + 8 = 0$$, then the value of $$g + c + h - f$$ equals

A

14

B

6

C

8

D

29