Given a premise, an initial context, an original ending, and a new ending, the task is to generate the counterfactual context that is aligned with the new ending. 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. The original ending is the last three sentences of the story. Also, you are given a new ending that can provide the new story with the same premise. You should write a counterfactual context to explain the small differences between the original and new endings. More specifically, a story context contains the general plot of the story. And a counterfactual context is a slight modification to the initial context. To sum up, you should write the second sentence of a story based on the premise(first sentence) and the new ending(last three sentences) of the story.
Q: Premise: I decided to take karate lessons. 
 Initial Context: I first day was embarrassing. 
 Original Ending: I was tripped by three people. I decided to practice very hard. After a month, I was the best in the class. 
 New ending: But then I was tripped by three people. I decided to practice very hard. After a month, I was the best in the class. 
A: 
I felt like I was the best in class by the end of the first day.