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 watches two giraffes eating from a box'. Reverse all words of length '4' in the given sentence.
Example Output: a man watches two giraffes eating morf a box

Example Input: Sentence: 'a bucket in a dingy looking cement walled bathroom'. Reverse all words of length '8' in the given sentence.
Example Output: a bucket in a dingy looking cement walled moorhtab

Example Input: Sentence: 'people on skis gather near the ski lift'. Reverse all words of length '2' in the given sentence.
Example Output:
people no skis gather near the ski lift