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 couple of toothbrushes that are on a towel'. Reverse all words of length '6' in the given sentence.
a elpuoc of toothbrushes that are on a towel

Sentence: 'a row of parked buses sitting in front of a buiding'. Reverse all words of length '6' in the given sentence.
a row of dekrap buses sitting in front of a buiding

Sentence: 'a cat with glowing eyes looks up from the bathtub'. Reverse all words of length '4' in the given sentence.

a cat htiw glowing seye looks up morf the bathtub