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 green apple and knife on dark wooden stairs'. Reverse all words of length '3' in the given sentence.
Example Output: a green apple dna knife on dark wooden stairs

Example Input: Sentence: 'a man on a motor bike pulling a person on a skate board'. Reverse all words of length '5' in the given sentence.
Example Output: a man on a rotom bike pulling a person on a etaks draob

Example Input: Sentence: 'a group of people are seating at a dinner table'. Reverse all words of length '2' in the given sentence.
Example Output:
a group fo people are seating ta a dinner table