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 gentleman and child in a vintage picture with a horse'. Reverse all words of length '4' in the given sentence.
a gentleman and child in a vintage picture htiw a horse

Sentence: 'a gray tiger cat sitting on top of a chair'. Reverse all words of length '3' in the given sentence.
a gray tiger tac sitting on pot of a chair

Sentence: 'an illuminated clock tower as seen as the sun is setting'. Reverse all words of length '7' in the given sentence.

an illuminated clock tower as seen as the sun is gnittes