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 child is inside standing on a skateboard'. Reverse all words of length '6' in the given sentence.
Example Output: a child is edisni standing on a skateboard

Example Input: Sentence: 'a water bottle sitting on top of a counter'. Reverse all words of length '6' in the given sentence.
Example Output: a water elttob sitting on top of a counter

Example Input: Sentence: 'skateboarder performing a grind on the side of the wall'. Reverse all words of length '4' in the given sentence.
Example Output:
skateboarder performing a grind on the edis of the llaw