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 red pair of scissors on top of an envelope'. Reverse all words of length '2' in the given sentence.
a red pair fo scissors no top fo na envelope

Sentence: 'a group of sheep graze in a grassy field'. Reverse all words of length '2' in the given sentence.
a group fo sheep graze ni a grassy field

Sentence: 'a woman brushing her teeth in a dull light room'. Reverse all words of length '1' in the given sentence.

a woman brushing her teeth in a dull light room