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: 'the dog looks up at the cat sitting on a stone'. Reverse all words of length '1' in the given sentence.
Example Output: the dog looks up at the cat sitting on a stone

Example Input: Sentence: 'the blue pair of scissors is next to cut pieces of plastic'. Reverse all words of length '8' in the given sentence.
Example Output: the blue pair of srossics is next to cut pieces of plastic

Example Input: Sentence: 'a vintage photo of a back pack with a picture on it'. Reverse all words of length '2' in the given sentence.
Example Output:
a vintage photo fo a back pack with a picture no ti