Detailed Instructions: 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.
Problem:Premise: My family has had many dogs. 
 Initial Context: For some reason, they seem to always be friendly. 
 Original Ending: One time, one of the dogs ate the other dog's puppies. This made the mother dog mad. From then on, we had to keep those two dogs separated. 
 Counterfactual Context: For some reason, they were always mean.
Solution:
One time, one of the dogs ate the other dog's puppies. This made the mother dog turn mean. From then on, we had to keep those two dogs separated. 