Task: Story Composition
Input (English): Premise: Jimmy wanted to be a mummy for Halloween. 
 Initial Context: He didn't have a costume though. 
 Original Ending: He came up with an idea. He poured a bag of flour over his head. He went trick or treating as a mummy. 
 Counterfactual Context: He bought a costume at the store.
Output (English): It didn't fit,  so came up with an idea. He poured a bag of flour over his head. He went trick or treating as a mummy.