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.

[EX Q]: Sentence: 'a person on a parachute landing on the water'. Reverse all words of length '2' in the given sentence.
[EX A]: a person no a parachute landing no the water

[EX Q]: Sentence: 'a group of motorcycle riders one with a side car'. Reverse all words of length '6' in the given sentence.
[EX A]: a group of motorcycle sredir one with a side car

[EX Q]: Sentence: 'the wet black bear is standing on rocks in the river'. Reverse all words of length '2' in the given sentence.
[EX A]:
the wet black bear si standing no rocks ni the river