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 bicycle parked on a bridge next to a marina'. Reverse all words of length '4' in the given sentence.
Example Output: a bicycle parked on a bridge txen to a marina

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: 'some little elephants standing around a few trees'. Reverse all words of length '9' in the given sentence.
Example Output:
some little stnahpele standing around a few trees