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: Dan went spelunking into a cave with some friends. 
 Initial Context: The cave lead into a series of tunnels, and some were very large. 
 Original Ending: One of the caves produced a very funny and deep echo. The group sent a few minutes playing with this before leaving. Upon getting out of the cave, Dan told everyone he had a great time. 
 Counterfactual Context: The cave started to creak and small pieces began to fall.
Student:
It produced a very eerie and deep echo. The group stood there in shock for a few seconds before running out. Upon getting out of the cave, Dan told everyone he had been terrified. 