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.

[Q]: Sentence: 'several people flying kites on a sandy beach'. Reverse all words of length '7' in the given sentence.
[A]: lareves people flying kites on a sandy beach


[Q]: Sentence: 'a river filled with lots of boats and surrounded by buildings'. Reverse all words of length '4' in the given sentence.
[A]: a river filled htiw stol of boats and surrounded by buildings


[Q]: Sentence: 'a person can be seen riding a wave on a surf board'. Reverse all words of length '3' in the given sentence.
[A]:
a person nac be seen riding a wave on a surf board