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 man and woman standing with luggage in a waiting area'. Reverse all words of length '7' in the given sentence.
a man and woman standing with egaggul in a gnitiaw area

Sentence: 'three cows graze on the food that sits just outside their pens'. Reverse all words of length '5' in the given sentence.
eerht cows ezarg on the food that sits just outside rieht pens

Sentence: 'a large canadian airliner flying through a blue sky'. Reverse all words of length '3' in the given sentence.

a large canadian airliner flying through a blue yks