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 man laying on a bench and a woman next to him touching his face'. Reverse all words of length '4' in the given sentence.
Example Output: a man laying on a bench and a woman txen to him touching his ecaf

Example Input: Sentence: 'a cat is playing with the bottom part of the umbrella'. Reverse all words of length '3' in the given sentence.
Example Output: a tac is playing with eht bottom part of eht umbrella

Example Input: Sentence: 'a man leaning over a tall fence near a couple of giraffes'. Reverse all words of length '1' in the given sentence.
Example Output:
a man leaning over a tall fence near a couple of giraffes