Definition: 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.
Input: Sentence: 'black and white kitchen in void of people and pets have stairs leading from the area'. Reverse all words of length '2' in the given sentence.

black and white kitchen ni void fo people and pets have stairs leading from the area