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: 'a man wearing a vest and tie posing for the camera'. Reverse all words of length '1' in the given sentence.
Example Output: a man wearing a vest and tie posing for the camera

Example Input: Sentence: 'a man walking in street with tie blowing in wind'. Reverse all words of length '7' in the given sentence.
Example Output:
a man gniklaw in street with tie gniwolb in wind