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: 'a green apple and knife on dark wooden stairs'. Reverse all words of length '3' in the given sentence.
[A]: a green apple dna knife on dark wooden stairs


[Q]: Sentence: 'an orange longhorn bull stands among the herd'. Reverse all words of length '2' in the given sentence.
[A]: na orange longhorn bull stands among the herd


[Q]: Sentence: 'a large grassy field filled with grazing cows'. Reverse all words of length '4' in the given sentence.
[A]:
a large grassy field filled htiw grazing swoc