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 man laying on a bench and a woman next to him touching his face'. Reverse all words of length '4' in the given sentence.
a man laying on a bench and a woman txen to him touching his ecaf

Sentence: 'a red two story bus travels along a road'. Reverse all words of length '5' in the given sentence.
a red two yrots bus travels gnola a road

Sentence: 'a cat standing behind a bush on a stone walkway'. Reverse all words of length '6' in the given sentence.

a cat standing dniheb a bush on a stone walkway