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 small kid walks down a aisle with an umbrella in hand'. Reverse all words of length '8' in the given sentence.
Example Output: a small kid walks down a aisle with an allerbmu in hand

Example Input: Sentence: 'a couple of elephants that are in some water'. Reverse all words of length '6' in the given sentence.
Example Output: a elpuoc of elephants that are in some water

Example Input: Sentence: 'a woman taking a picture of some flowers with her phone'. Reverse all words of length '4' in the given sentence.
Example Output:
a woman taking a picture of emos flowers htiw her phone