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: 'an elderly man in a jacket is walking outside of a window'. Reverse all words of length '3' in the given sentence.
an elderly nam in a jacket is walking outside of a window

Sentence: 'a red train and a blueyellow train stopped next to each other'. Reverse all words of length '10' in the given sentence.

a red train and a wolleyeulb train stopped next to each other