Task: Story Composition
Input (English): Premise: Brandon went to the mailbox. 
 Initial Context: He opened an envelope that reminded him of an overdue book. 
 Original Ending: He immediately drove to the library. The clerk researched his late payment. She said that the system made a mistake since he already gave the book 
 Counterfactual Context: He opened an envelope that had a birthday card inside.
Output (English): He immediately read the card. The card was very nice. It wished him a happy birthday.