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 in bear feet standing on a skateboard'. Reverse all words of length '4' in the given sentence.
a person in raeb teef standing on a skateboard

Sentence: 'a woman is hiding behind a man holding a skateboard'. Reverse all words of length '1' in the given sentence.
a woman is hiding behind a man holding a skateboard

Sentence: 'a frosted donut with half covered in sprinkles'. Reverse all words of length '7' in the given sentence.

a detsorf donut with half derevoc in sprinkles