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: 'many pairs of open scissors sit on top of metal poles'. Reverse all words of length '4' in the given sentence.
Example Output: ynam pairs of nepo scissors sit on top of metal poles

Example Input: Sentence: 'the couple are smiling at each other as they sit on a bench'. Reverse all words of length '4' in the given sentence.
Example Output: the couple are smiling at hcae other as yeht sit on a bench

Example Input: Sentence: 'a colorful passenger bus makes its way across the bridge while pedestrians walk across in the pedestrian lane on the other side of the fence'. Reverse all words of length '4' in the given sentence.
Example Output:
a colorful passenger bus makes its way across the bridge while pedestrians klaw across in the pedestrian enal on the other edis of the fence