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: 'two young boys standing on grass near a fence'. Reverse all words of length '8' in the given sentence.

Answer: two young boys gnidnats on grass near a fence


Question: Sentence: 'someone is sitting on a elephant and messing with the seat'. Reverse all words of length '7' in the given sentence.

Answer: enoemos is gnittis on a elephant and gnissem with the seat


Question: Sentence: 'a shovel is loading dirt into a dump truck at a construction site'. Reverse all words of length '4' in the given sentence.

Answer:
a shovel is loading trid otni a pmud truck at a construction etis