Six persons, D, E, F G, H and I, stand in a straight line in decreasing order of their height. The one, who is the tallest, stands on the left most extreme end, while the one, who is the shortest, stands on the right most extreme end. D is taller than only three persons. E is taller than F, who is not the shortest. E is shorter than
D. G is taller than
I. G is not the tallest. How many persons are shorter than H?