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 stop sign next to houses with christmas lights'. Reverse all words of length '4' in the given sentence.
a pots ngis txen to houses htiw christmas lights

Sentence: 'a dog is sleeping on a boat in the water'. Reverse all words of length '2' in the given sentence.
a dog si sleeping no a boat ni the water

Sentence: 'a couple is looking at a tablet while they prepare fish'. Reverse all words of length '1' in the given sentence.

a couple is looking at a tablet while they prepare fish