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.

[EX Q]: Sentence: 'there are many animals standing on the top of this mountain'. Reverse all words of length '4' in the given sentence.
[EX A]: there are ynam animals standing on the top of siht mountain

[EX Q]: Sentence: 'a couple of toothbrushes that are on a towel'. Reverse all words of length '6' in the given sentence.
[EX A]: a elpuoc of toothbrushes that are on a towel

[EX Q]: Sentence: 'a person a on a motor bike and a group of people'. Reverse all words of length '3' in the given sentence.
[EX A]:
a person a on a motor bike dna a group of people