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: 'three zebras are standing on a grassy field'. Reverse all words of length '1' in the given sentence.
Example Output: three zebras are standing on a grassy field

Example Input: Sentence: 'a group of boys surfing in water'. Reverse all words of length '4' in the given sentence.
Example Output: a group of syob surfing in water

Example Input: Sentence: 'a guy stands near a pond with a frisbee'. Reverse all words of length '6' in the given sentence.
Example Output:
a guy sdnats near a pond with a frisbee