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: Justin built a big snow fort last week. 
 Initial Context: The fort was over four feet tall. 
 Original Ending: Justin would use it to hide in during snowball fights. The sun came out and the weather warmed up. The snow fort melted and is just a pile of snow now. 
 Counterfactual Context: He was so proud of the fort and his jealous brother kicked the fort down out of meanness.
Output:
Justin would use it to hide in during snowball fights before the brother destroyed it. The sun came out and the weather warmed up. The snow fort would have melted, even if his brother handn't destroyed it. 