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.
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Question: Sentence: 'a river filled with lots of boats and surrounded by buildings'. Reverse all words of length '4' in the given sentence.

Answer: a river filled htiw stol of boats and surrounded by buildings


Question: Sentence: 'a bunch off stuffed animals are on a car'. Reverse all words of length '7' in the given sentence.

Answer: a bunch off deffuts slamina are on a car


Question: Sentence: 'a man sitting on top of a bike in a building'. Reverse all words of length '7' in the given sentence.

Answer:
a man gnittis on top of a bike in a building