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 person in a rowboat under an umbrella'. Reverse all words of length '5' in the given sentence.

Answer: a person in a rowboat rednu an umbrella


Question: Sentence: 'a large elephant standing in the wild'. Reverse all words of length '5' in the given sentence.

Answer: a egral elephant standing in the wild


Question: Sentence: 'a train is slowly riding along a train track in an old city'. Reverse all words of length '4' in the given sentence.

Answer:
a train is slowly riding along a train track in an old ytic