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.
--------
Question: Sentence: 'several people flying kites on a sandy beach'. Reverse all words of length '7' in the given sentence.

Answer: lareves people flying kites on a sandy beach


Question: Sentence: 'the cox is standing behind the fence alone'. Reverse all words of length '2' in the given sentence.

Answer: the cox si standing behind the fence alone


Question: Sentence: 'an old train station sign points to northbound trains'. Reverse all words of length '5' in the given sentence.

Answer:
an old niart station sign points to northbound trains