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 train billowing smoke as it crosses a river by bridge'. Reverse all words of length '1' in the given sentence.
answer:
a train billowing smoke as it crosses a river by bridge


question:
Sentence: 'a hotdog with cheese with a side of chili fries'. Reverse all words of length '4' in the given sentence.
answer:
a hotdog htiw cheese htiw a edis of chili fries


question:
Sentence: 'several young men in coats and ties holding a united nations flag'. Reverse all words of length '1' in the given sentence.
answer:

several young men in coats and ties holding a united nations flag