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: 'giraffes are standing in the grass near water and trees'. Reverse all words of length '4' in the given sentence.
Example Output: giraffes are standing in the grass raen water and trees

Example Input: Sentence: 'a plate of food that includes fish and broccoli'. Reverse all words of length '8' in the given sentence.
Example Output: a plate of food that sedulcni fish and iloccorb

Example Input: Sentence: 'a couple of brown horses standing on a lush green field'. Reverse all words of length '2' in the given sentence.
Example Output:
a couple fo brown horses standing no a lush green field