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.

Sentence: 'a young brown horse in a blue jacket running in a barn'. Reverse all words of length '4' in the given sentence.
a young brown horse in a eulb jacket running in a nrab

Sentence: 'a man leaning forward as he swings a tennis racket'. Reverse all words of length '2' in the given sentence.
a man leaning forward sa eh swings a tennis racket

Sentence: 'three giraffes in a field with an egyptian theme in the background'. Reverse all words of length '4' in the given sentence.

three giraffes in a field htiw an egyptian theme in the background