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.

[EX Q]: Sentence: 'a man walking a brown horse down a race track'. Reverse all words of length '4' in the given sentence.
[EX A]: a man walking a brown horse nwod a ecar track

[EX Q]: Sentence: 'a blue sign sitting on the side of a road next to a tree'. Reverse all words of length '1' in the given sentence.
[EX A]: a blue sign sitting on the side of a road next to a tree

[EX Q]: Sentence: 'a man sitting at a table with a plate and cup in front of him and two other guys in the background'. Reverse all words of length '3' in the given sentence.
[EX A]:
a nam sitting at a table with a plate dna puc in front of mih dna owt other guys in eht background