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 colorful passenger bus makes its way across the bridge while pedestrians walk across in the pedestrian lane on the other side of the fence'. Reverse all words of length '4' in the given sentence.

a colorful passenger bus makes its way across the bridge while pedestrians klaw across in the pedestrian enal on the other edis of the fence