In this task, you need to reverse all words of a given length in the sentence. The number of letters in a word determine its length. For example, the length of the word "apple" is 5.

Sentence: 'black and silver fire hydrant sitting next to a road'. Reverse all words of length '7' in the given sentence.
black and silver fire tnardyh gnittis next to a road

Sentence: 'a tennis player is swinging at a tennis ball'. Reverse all words of length '2' in the given sentence.
a tennis player si swinging ta a tennis ball

Sentence: 'a boy doing a skateboard trick in the air'. Reverse all words of length '5' in the given sentence.

a boy gniod a skateboard kcirt in the air