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: Greg saw a mouse in his kitchen.
Initial Context: He went out and bought a cat to catch it.
Original Ending: He waited and waited but saw no dead mouse. Thinking his cat was useless he almost returned it. Finally, he woke up in horror to see a dead mouse on his pillow.
Counterfactual Context: He went out and bought a humane trap, caught the mouse and put it out in a field.
Output:
He waited and waited but the mouse wouldn't leave. Thinking the mouse was stupid he almost returned it. Finally, he noticed in horror to see the mouse was dead.