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

Sentence: 'a blie bag is sitting on a desk'. Reverse all words of length '2' in the given sentence.
a blie bag si sitting no a desk

Sentence: 'a young girl outside with a skateboard and a helmet'. Reverse all words of length '5' in the given sentence.

a gnuoy girl outside with a skateboard and a helmet