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.

[Q]: Sentence: 'a person holding a yummy looking hot dog'. Reverse all words of length '7' in the given sentence.
[A]: a person gnidloh a yummy gnikool hot dog


[Q]: Sentence: 'a red double decker bus parked next to a brick building'. Reverse all words of length '4' in the given sentence.
[A]: a red double decker bus parked txen to a brick building


[Q]: Sentence: 'a couple of doughnuts that are in a tray'. Reverse all words of length '4' in the given sentence.
[A]:
a couple of doughnuts taht are in a yart