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 small elephant standing next to a forest full of trees'. Reverse all words of length '5' in the given sentence.
a llams elephant standing next to a forest full of seert

Sentence: 'a plate wit some very tasty looking treats'. Reverse all words of length '6' in the given sentence.
a plate wit some very tasty looking staert

Sentence: 'a snow skier is going down a hill in the snow'. Reverse all words of length '4' in the given sentence.

a wons skier is going nwod a llih in the wons