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.

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

Sentence: 'a herd of zebra standing in a forest'. Reverse all words of length '1' in the given sentence.
a herd of zebra standing in a forest

Sentence: 'the living room has many pillows on the couches and chair'. Reverse all words of length '5' in the given sentence.

the living room has many pillows on the couches and riahc