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.

[Q]: Sentence: 'many cows on a field of grass with trees in the background'. Reverse all words of length '1' in the given sentence.
[A]: many cows on a field of grass with trees in the background


[Q]: 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]: a blue sign sitting on the side of a road next to a tree


[Q]: Sentence: 'a black bear walks across a green field'. Reverse all words of length '5' in the given sentence.
[A]:
a kcalb bear sklaw across a neerg dleif