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 guy on  a surf board by a very big wave'. Reverse all words of length '3' in the given sentence.

Answer: a yug on a surf board by a very gib wave


Question: Sentence: 'a large eared dog sitting on an office chair'. Reverse all words of length '3' in the given sentence.

Answer: a large eared god sitting on an office chair


Question: Sentence: 'a boy is looking at his cellphone in a bathroom'. Reverse all words of length '8' in the given sentence.

Answer:
a boy is looking at his cellphone in a moorhtab