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 giraffes standing next to a fence trying to reach the grass'. Reverse all words of length '6' in the given sentence.
Example Output: two giraffes standing next to a fence gniyrt to reach the grass

Example Input: Sentence: 'a very pretty plate filled with some good looking food'. Reverse all words of length '5' in the given sentence.
Example Output: a very pretty etalp filled with some good looking food

Example Input: Sentence: 'pro tennis player in the act of serving the ball'. Reverse all words of length '4' in the given sentence.
Example Output:
pro tennis player in the act of serving the llab