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 gray tiger cat sitting on top of a chair'. Reverse all words of length '3' in the given sentence.
Example Output: a gray tiger tac sitting on pot of a chair

Example Input: Sentence: 'two motorcycles sidebyside parked in a grassy area'. Reverse all words of length '3' in the given sentence.
Example Output: owt motorcycles sidebyside parked in a grassy area

Example Input: Sentence: 'a woman speaks into her microphone while looking at the cow'. Reverse all words of length '7' in the given sentence.
Example Output:
a woman speaks into her microphone while gnikool at the cow