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.

Example Input: Sentence: 'a group of zebras gather at a watering hole'. Reverse all words of length '1' in the given sentence.
Example Output: a group of zebras gather at a watering hole

Example Input: Sentence: 'this is people standing in a field with kites'. Reverse all words of length '8' in the given sentence.
Example Output: this is people gnidnats in a field with kites

Example Input: Sentence: 'two zebras are near two ostriches in this picture'. Reverse all words of length '6' in the given sentence.
Example Output:
two sarbez are near two ostriches in this picture