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: 'the tennis players are participating in a lively match'. Reverse all words of length '6' in the given sentence.
Example Output: the sinnet players are participating in a ylevil match

Example Input: Sentence: 'a couple of trains are sitting on some tracks'. Reverse all words of length '2' in the given sentence.
Example Output: a couple fo trains are sitting no some tracks

Example Input: Sentence: 'a woman in a striped shirt holding a tennis racket in her right hand'. Reverse all words of length '6' in the given sentence.
Example Output:
a woman in a striped shirt holding a sinnet tekcar in her right hand