Definition: 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.
Input: Premise: Dave went to the beach with buckets. 
 Initial Context: He began to take sand from the beach and put it into buckets. 
 Original Ending: He took the buckets home. In Dave's backyard was a square wooden box in which he dumped sand. Now Dave had a proper sandbox with real beach sand. 
 Counterfactual Context: He filled the buckets with water.
Output:
He dumped out the water and filled them with sand instead, then took the buckets home. In Dave's backyard was a square wooden box in which he dumped sand. Now Dave had a proper sandbox with real beach sand. 