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 wooden bench sits on top of a grass hill'. Reverse all words of length '2' in the given sentence.
a wooden bench sits no top fo a grass hill

Sentence: 'a young teenage girl practicing skiing on small waves'. Reverse all words of length '2' in the given sentence.
a young teenage girl practicing skiing no small waves

Sentence: 'two people standing in a shadow with a kite in the sky above them'. Reverse all words of length '6' in the given sentence.

two elpoep standing in a wodahs with a kite in the sky above them