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 man is in the air riding a skateboard outside'. Reverse all words of length '2' in the given sentence.
a man si ni the air riding a skateboard outside

Sentence: 'a group of snow boarders pose in the snow on top of a hill'. Reverse all words of length '5' in the given sentence.
a puorg of snow boarders pose in the snow on top of a hill

Sentence: 'a vintage photo of a man washing a lamb'. Reverse all words of length '5' in the given sentence.

a vintage otohp of a man washing a lamb