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: 'people walking pass many different designed kites that are in the air'. Reverse all words of length '4' in the given sentence.

people walking ssap ynam different designed kites taht are in the air