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: 'two birds standing and sticking their heads in muddy water'. Reverse all words of length '3' in the given sentence.

SOLUTION: owt birds standing dna sticking their heads in muddy water

PROBLEM: Sentence: 'a group of people wearing skis and standing at the top of a ski slope'. Reverse all words of length '7' in the given sentence.

SOLUTION: a group of people gniraew skis and standing at the top of a ski slope

PROBLEM: Sentence: 'someone is riding a decorated elephant in the dark'. Reverse all words of length '8' in the given sentence.

SOLUTION:
someone is riding a decorated tnahpele in the dark