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 couple of elephants that are in some water'. Reverse all words of length '6' in the given sentence.
Example Output: a elpuoc of elephants that are in some water

Example Input: Sentence: 'a road decorated for christmas and trees without leaves'. Reverse all words of length '1' in the given sentence.
Example Output: a road decorated for christmas and trees without leaves

Example Input: Sentence: 'a laptop router and other electronic device on a coffee table'. Reverse all words of length '2' in the given sentence.
Example Output:
a laptop router and other electronic device no a coffee table