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: 'an umbrella sitting on top of a hill next to a body of water'. Reverse all words of length '4' in the given sentence.
an umbrella sitting on top of a llih txen to a ydob of water

Sentence: 'a cat has is sticking its head in the toilet'. Reverse all words of length '8' in the given sentence.
a cat has is gnikcits its head in the toilet

Sentence: 'a young person trekking through the snow'. Reverse all words of length '3' in the given sentence.

a young person trekking through eht snow