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: 'park bench on the side of the road in front of red car'. Reverse all words of length '4' in the given sentence.

krap bench on the edis of the daor in front of red car