Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Premise: Ellen had cockroaches in her small apartment. 
 Initial Context: She wanted to get rid of them but never had the time. 
 Original Ending: Finally she called an exterminator to kill the cockroaches. The exterminator killed them. Ellen is happy now that her apartment doesn't have cockroaches. 
 Counterfactual Context: She wanted to keep them but never had the time.
Student:
She knew it was best to call an exterminator and not try to keep them around. The exterminator killed them. Ellen is sad now that her apartment doesn't have cockroaches. 