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: 'three people with backpacks on skies moving up a hill'. Reverse all words of length '9' in the given sentence.
Example Output: three people with skcapkcab on skies moving up a hill

Example Input: Sentence: 'an image of a group of people sitting in the snow'. Reverse all words of length '6' in the given sentence.
Example Output: an image of a group of elpoep sitting in the snow

Example Input: Sentence: 'a double decker bus driving on a snowy day'. Reverse all words of length '6' in the given sentence.
Example Output:
a elbuod rekced bus driving on a snowy day