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.

Sentence: 'a bird sitting in a tree next to a citrus fruit'. Reverse all words of length '6' in the given sentence.
a bird sitting in a tree next to a surtic fruit

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

Sentence: 'people are doing something at this time that is bolting'. Reverse all words of length '3' in the given sentence.

people era doing something at this time that is bolting