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 group of people eating a cake on a table'. Reverse all words of length '6' in the given sentence.
Example Output: a group of elpoep gnitae a cake on a table

Example Input: Sentence: 'a cat with a santa hat standing on a rug'. Reverse all words of length '8' in the given sentence.
Example Output: a cat with a santa hat gnidnats on a rug

Example Input: Sentence: 'a female tennis player about to hit the ball'. Reverse all words of length '4' in the given sentence.
Example Output:
a female tennis player about to hit the llab