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: 'young skateboarder on paved roadway near grassy slope'. Reverse all words of length '6' in the given sentence.
Example Output: young skateboarder on paved roadway near yssarg slope

Example Input: Sentence: 'a close up of the front of a train on train tracks'. Reverse all words of length '3' in the given sentence.
Example Output: a close up of eht front of a train on train tracks

Example Input: Sentence: 'a male tennis player playing tennis on the court'. Reverse all words of length '7' in the given sentence.
Example Output:
a male tennis player gniyalp tennis on the court