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: 'two people with umbrellas try to get out of the rain'. Reverse all words of length '4' in the given sentence.

two people htiw umbrellas try to get out of the niar