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 person in skis is standing in the snow'. Reverse all words of length '2' in the given sentence.
Example Output: a person ni skis si standing ni the snow

Example Input: Sentence: 'a young teenage girl practicing skiing on small waves'. Reverse all words of length '2' in the given sentence.
Example Output: a young teenage girl practicing skiing no small waves

Example Input: Sentence: 'a woman is playing tennis on a brown dirt court'. Reverse all words of length '2' in the given sentence.
Example Output:
a woman si playing tennis no a brown dirt court