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: 'there are two men sitting on a park bench'. Reverse all words of length '5' in the given sentence.
ereht are two men sitting on a park hcneb

Sentence: 'a couple of elephants that are in some water'. Reverse all words of length '6' in the given sentence.
a elpuoc of elephants that are in some water

Sentence: 'a group of farmers get ready to load their horses with supplies'. Reverse all words of length '3' in the given sentence.

a group of farmers teg ready to load their horses with supplies

