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: 'a person parasails in water with mountains in the background'. Reverse all words of length '4' in the given sentence.
[EX A]: a person parasails in water htiw mountains in the background

[EX Q]: Sentence: 'a group of sheep graze in a grassy field'. Reverse all words of length '2' in the given sentence.
[EX A]: a group fo sheep graze ni a grassy field

[EX Q]: Sentence: 'a city bus parked along the road at a bus stop'. Reverse all words of length '1' in the given sentence.
[EX A]:
a city bus parked along the road at a bus stop