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 going on a slop jump on skis'. Reverse all words of length '6' in the given sentence.
Example Output: a nosrep going on a slop jump on skis

Example Input: Sentence: 'three brown horses standing in a green field'. Reverse all words of length '5' in the given sentence.
Example Output: eerht nworb horses standing in a neerg dleif

Example Input: Sentence: 'a bird in front of a mirror outside'. Reverse all words of length '5' in the given sentence.
Example Output:
a bird in tnorf of a mirror outside