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 cows graze on the food that sits just outside their pens'. Reverse all words of length '5' in the given sentence.
Example Output: eerht cows ezarg on the food that sits just outside rieht pens

Example Input: Sentence: 'a vintage photo of a man riding an old motorcycle'. Reverse all words of length '7' in the given sentence.
Example Output: a egatniv photo of a man riding an old motorcycle

Example Input: Sentence: 'three traffic lights on the same pole one is lit red while the other two are green'. Reverse all words of length '2' in the given sentence.
Example Output:
three traffic lights no the same pole one si lit red while the other two are green