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 group of skiers standing at the base of a mountain'. Reverse all words of length '3' in the given sentence.

Answer: a group of skiers standing at eht base of a mountain


Question: Sentence: 'two giraffes standing next to a fence trying to reach the grass'. Reverse all words of length '6' in the given sentence.

Answer: two giraffes standing next to a fence gniyrt to reach the grass


Question: Sentence: 'a man sitting near a bar with a beer bottle'. Reverse all words of length '4' in the given sentence.

Answer:
a man sitting raen a bar htiw a reeb bottle