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: 'a tray of brownies and a layered cake sitting on top of a stove'. Reverse all words of length '2' in the given sentence.

a tray fo brownies and a layered cake sitting no top fo a stove