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: Tom liked to download things on the computer. 
 Initial Context: He often did this without checking the safety of the website. 
 Original Ending: One day, his computer stopped working. He took it to a technician, who said it had a virus. Tom suddenly wished he had been more careful downloading files. 
 Counterfactual Context: He always ran the latest antivirus software and was careful about what he downloaded.
Output:
One day, his computer stopped working. He took it to a technician, who said it had a virus. Tom suddenly realized he hadn't been careful enough downloading files. 