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: Mitchell has always been good at basketball. 
 Initial Context: He decided that he wanted to play football instead. 
 Original Ending: Mitchell learned everything he could about the new sport. He practiced every day. Now, Mitchell is just as good at football as he was at basketball. 
 Counterfactual Context: He decided he wanted to take on chess instead.
Student:
Mitchell learned everything he could about the new game. He practiced every day. Now, Mitchell is good at chess and basketball. 