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.

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

A: a group of skiers standing at eht base of a mountain
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Q: Sentence: 'a girl with a cast on her arm stands in a bathroom'. Reverse all words of length '3' in the given sentence.

A: a girl with a cast on reh mra stands in a bathroom
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Q: Sentence: 'a passenger train that is pulling into the station'. Reverse all words of length '9' in the given sentence.

A:
a regnessap train that is pulling into the station
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