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 train is in a depot at the platform entry'. Reverse all words of length '2' in the given sentence.
Example Output: a train si ni a depot ta the platform entry

Example Input: Sentence: 'a man taking a photo with his chocolate dessert and a beer'. Reverse all words of length '9' in the given sentence.
Example Output: a man taking a photo with his etalocohc dessert and a beer

Example Input: Sentence: 'a silver train travelling on tracks suspended above the ground'. Reverse all words of length '2' in the given sentence.
Example Output:
a silver train travelling no tracks suspended above the ground