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: 'two people are holding rackets upright on a tennis court'. Reverse all words of length '7' in the given sentence.
Example Output: two people are gnidloh stekcar thgirpu on a tennis court

Example Input: Sentence: 'a person holding a yummy looking hot dog'. Reverse all words of length '7' in the given sentence.
Example Output: a person gnidloh a yummy gnikool hot dog

Example Input: Sentence: 'a man in a suit carefully adjusts his tie'. Reverse all words of length '9' in the given sentence.
Example Output:
a man in a suit ylluferac adjusts his tie