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 dog standing on top of a dirt field next to a frisbee'. Reverse all words of length '4' in the given sentence.
Example Output: a dog standing on top of a trid field txen to a frisbee

Example Input: Sentence: 'a female tennis player is running to catch the ball'. Reverse all words of length '6' in the given sentence.
Example Output: a elamef sinnet reyalp is running to catch the ball

Example Input: Sentence: 'the train is now leaving the subway station'. Reverse all words of length '5' in the given sentence.
Example Output:
the niart is now leaving the subway station