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 woman is riding a show horse at a competition'. Reverse all words of length '6' in the given sentence.
Example Output: a woman is gnidir a show horse at a competition

Example Input: Sentence: 'a knife sits next to a carrot on a cutting board'. Reverse all words of length '7' in the given sentence.
Example Output: a knife sits next to a carrot on a gnittuc board

Example Input: Sentence: 'there are a bunch of people playing wii'. Reverse all words of length '2' in the given sentence.
Example Output:
there are a bunch fo people playing wii