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 man walking a brown horse down a race track'. Reverse all words of length '4' in the given sentence.
Example Output: a man walking a brown horse nwod a ecar track

Example Input: Sentence: 'a person siting on the ground and decorating a parking meter'. Reverse all words of length '5' in the given sentence.
Example Output: a person siting on the ground and decorating a parking retem

Example Input: Sentence: 'two cats are crowded around a duffle bag'. Reverse all words of length '3' in the given sentence.
Example Output:
owt cats era crowded around a duffle gab