Task: Story Composition
Input (English): Premise: Nick started to feel a lot of pain in his hip when he walked. 
 Initial Context: Taking pills did not help his hip, so Nick went to see his doctor. 
 Original Ending: The doctor said Nick needed surgery to replace his old, worn-out hip. They scheduled an operation for the next month, and it was a success. Now Nick is pain-free and can walk as much as he likes! 
 Counterfactual Context: Taking pills helped his hip so he didn't need to see his doctor.
Output (English): Once the pills were no longer effective he went to the doctor. The doctor said Nick needed surgery to replace his old, worn-out hip. They scheduled an operation for the next month, and it was a success.