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 group of people riding in a black raft'. Reverse all words of length '1' in the given sentence.
Example Output: a group of people riding in a black raft

Example Input: Sentence: 'my goodness it sure appears that there is a sandwich on that white plate'. Reverse all words of length '2' in the given sentence.
Example Output:
ym goodness ti sure appears that there si a sandwich no that white plate