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 person at a zoo looking over the fence of a giraffe enclosure'. Reverse all words of length '6' in the given sentence.

SOLUTION: a nosrep at a zoo looking over the fence of a giraffe enclosure

PROBLEM: Sentence: 'a young boy plays with a phone sitting on the ground'. Reverse all words of length '6' in the given sentence.

SOLUTION: a young boy plays with a phone sitting on the dnuorg

PROBLEM: Sentence: 'a build in refridgerator has its doors open'. Reverse all words of length '13' in the given sentence.

SOLUTION:
a build in rotaregdirfer has its doors open