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 bunch of umbrellas are up in the air'. Reverse all words of length '9' in the given sentence.
a bunch of sallerbmu are up in the air

Sentence: 'a train platform at a train stop with brick style flooring'. Reverse all words of length '2' in the given sentence.
a train platform ta a train stop with brick style flooring

Sentence: 'a man and a woman cutting a cake with a knife'. Reverse all words of length '4' in the given sentence.

a man and a woman cutting a ekac htiw a knife