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.

Example Input: Sentence: 'a person on a parachute landing on the water'. Reverse all words of length '2' in the given sentence.
Example Output: a person no a parachute landing no the water

Example Input: Sentence: 'a man is standing on a sidewalk with his bike'. Reverse all words of length '3' in the given sentence.
Example Output: a nam is standing on a sidewalk with sih bike

Example Input: Sentence: 'several goats graze on a rocky plain in the hills'. Reverse all words of length '7' in the given sentence.
Example Output:
lareves goats graze on a rocky plain in the hills