instruction:
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: '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: 'three brown horses standing in a green field'. Reverse all words of length '5' in the given sentence.
answer:
eerht nworb horses standing in a neerg dleif


question:
Sentence: 'a log with attached backings of chairs sits on the floor'. Reverse all words of length '4' in the given sentence.
answer:

a log htiw attached backings of chairs stis on the floor