Task: Story Composition
Input (English): Premise: Billy wanted to throw a big party at his house. 
 Initial Context: Buying beer in single bottles, would cost a lot of money. 
 Original Ending: Billy didn't have a lot of money. He decided to buy a keg, instead. He had enough beer and money left over. 
 New ending: Billy didn't have a lot of money. He decided to buy only one keg, instead. He had enough beer and money left over. 
Output (English): Buying kegs was the only option.