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If the people are assigned the numbers 1-6 (where 1 is the lowest height and 6 is the greatest)

The positions of 1 and 6 can't be moved...
a b 6
1 c d

2,3,4 and 5 have to be fit into positions a,b,c and d

If a=2, there are 3 possibilities of b: 3,4,5...for each of these possibilities the remaining two numbers can only be placed in 1 order in c & d (as they have to be ascending)

If a=3, there are two possibilities of b:4,5...for each, the remaining two numbers can only be placed in 1 order is c&d

If a=4, there is only one possibility of b:5...and c&d can only be placed in 1 way

a can't be 5 (as there is no person to fit into position b)