Instructions: 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.
Input: Premise: On July 10th, we went to Joe C's birthday party. 
 Initial Context: He was turning 99 on July 13th. 
 Original Ending: His daughter, a musician, had several friends sing and play music. Other guests recited poetry to Joe, an amateur poet. Despite his age, Joe stayed at the party well past midnight. 
 New ending: His mother,  a musician, had several friends sing and play music. Other guests read stories to Joe, a story writer. Despite his age, Joe was allowed to stay at the party well past midnight. 
Output:
He was turning 9 on July 13th.