TASK DEFINITION: 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.
PROBLEM: Sentence: 'a red pair of scissors on top of an envelope'. Reverse all words of length '2' in the given sentence.

SOLUTION: a red pair fo scissors no top fo na envelope

PROBLEM: Sentence: 'the dog looks up at the cat sitting on a stone'. Reverse all words of length '1' in the given sentence.

SOLUTION: the dog looks up at the cat sitting on a stone

PROBLEM: Sentence: 'a man who is speaking at a podium'. Reverse all words of length '2' in the given sentence.

SOLUTION:
a man who si speaking ta a podium