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 cat sleeping with is hear resting on a keyboard'. Reverse all words of length '4' in the given sentence.
a cat sleeping htiw is raeh resting on a keyboard

Sentence: 'the tour buses are driving away from the building'. Reverse all words of length '5' in the given sentence.
the tour sesub are driving away from the building

Sentence: 'a messy bedroom with items covering the floor'. Reverse all words of length '8' in the given sentence.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
a messy bedroom with items gnirevoc the floor

