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 person parasails in water with mountains in the background'. Reverse all words of length '4' in the given sentence.
a person parasails in water htiw mountains in the background

Sentence: 'an asian man stands in front of the sink of a messy kitchen and smiles'. Reverse all words of length '4' in the given sentence.
an asian man stands in front of the knis of a messy kitchen and smiles

Sentence: 'a man in a grassy field holding a frisbee'. Reverse all words of length '2' in the given sentence.

a man ni a grassy field holding a frisbee