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 egg salad sandwich on with bread and some type of a roll'. Reverse all words of length '4' in the given sentence.

a egg salad sandwich on htiw bread and emos epyt of a llor