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: 'one brush laying on top of another with both having zebra patterns'. Reverse all words of length '4' in the given sentence.

one brush laying on top of another htiw htob having zebra patterns