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 blue sign sitting on the side of a road next to a tree'. Reverse all words of length '1' in the given sentence.
a blue sign sitting on the side of a road next to a tree

Sentence: 'a single round bread object frying in oil'. Reverse all words of length '1' in the given sentence.
a single round bread object frying in oil

Sentence: 'a couple of laptops on a long table'. Reverse all words of length '1' in the given sentence.

a couple of laptops on a long table