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: 'an umbrella sitting on top of a hill next to a body of water'. Reverse all words of length '4' in the given sentence.

SOLUTION: an umbrella sitting on top of a llih txen to a ydob of water

PROBLEM: Sentence: 'a mix of vegetables in a pot with a spoon'. Reverse all words of length '4' in the given sentence.

SOLUTION: a mix of vegetables in a pot htiw a spoon

PROBLEM: Sentence: 'a stop sign and a bus stop sign'. Reverse all words of length '4' in the given sentence.

SOLUTION:
a pots ngis and a bus pots ngis