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: 'four cute little ducklings swimming in the water'. Reverse all words of length '6' in the given sentence.

SOLUTION: four cute elttil ducklings swimming in the water

PROBLEM: Sentence: 'a cat is playing with the bottom part of the umbrella'. Reverse all words of length '3' in the given sentence.

SOLUTION: a tac is playing with eht bottom part of eht umbrella

PROBLEM: Sentence: 'red jello with fruit in container in microwave'. Reverse all words of length '9' in the given sentence.

SOLUTION:
red jello with fruit in reniatnoc in evaworcim