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 plate with a very big pile of cake with candles'. Reverse all words of length '4' in the given sentence.

SOLUTION: a plate htiw a yrev big elip of ekac htiw candles

PROBLEM: Sentence: 'a skateboarder in mid air during a trick'. Reverse all words of length '6' in the given sentence.

SOLUTION: a skateboarder in mid air gnirud a trick

PROBLEM: Sentence: 'a herd of elephants walking along a river'. Reverse all words of length '5' in the given sentence.

SOLUTION:
a herd of elephants walking gnola a revir