Eight people, A, B, C, D, E, F, G and H are sitting in a straight line, facing north. Only three people sit to the left of A. B sits third to the right of A. Only four people sit between B and D. F sits to the immediate right of G. C does not sit at any of the extreme ends of the line. E sits at one of the positions to the right of H. How many people sit between H and A?