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 white bear stuff toy sitting next to a mini chair and book'. Reverse all words of length '1' in the given sentence.

SOLUTION: a white bear stuff toy sitting next to a mini chair and book

PROBLEM: Sentence: 'competitor preparing to return volley during major tennis tournament'. Reverse all words of length '6' in the given sentence.

SOLUTION: competitor preparing to nruter yellov gnirud major sinnet tournament

PROBLEM: Sentence: 'a train traveling through a train station with people standing outside of it'. Reverse all words of length '9' in the given sentence.

SOLUTION:
a train gnilevart through a train station with people standing outside of it