You will be given a definition of a task first, then some input of the task.
Given a premise, an initial context, an original ending, and a counterfactual context, the task is to generate a new story ending aligned with the counterfactual context and as close to the original ending as possible. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context and the story's general plot. The original ending is the last three sentences of the story. Also, a counterfactual context is a slight modification to the initial context. You should write a new story ending that edits the original story ending as little as possible to regain coherence with the counterfactual context. To sum up, you should write the last three sentences of a story based on the premise(first sentence) and the counterfactual context(second sentence) of the story.

Premise: Peter adopted a dog from the pound one day. 
 Initial Context: He brought the dog home and fed it. 
 Original Ending: He played with the dog and showed it a dog bed. He gave it a bone for a treat. The dog fell asleep, and Peter went to bed. 
 Counterfactual Context: He took the dog to the vet first to make sure it was healthy and left him there overnight.
Output:
He picked the dog up, and played with it all day. He gave it a bone for a treat. The dog fell asleep, and Peter went to bed. 