Given the task definition and input, reply with output. Given a premise, an initial context, an original ending, and a counterfactual context, the task is to generate a new story ending aligned with the counterfactual context and as close to the original ending as possible. 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 and the story's general plot. The original ending is the last three sentences of the story. Also, a counterfactual context is a slight modification to the initial context. You should write a new story ending that edits the original story ending as little as possible to regain coherence with the counterfactual context. To sum up, you should write the last three sentences of a story based on the premise(first sentence) and the counterfactual context(second sentence) of the story.

Premise: My cat tried to swat the mailman through our mail slot. 
 Initial Context: I heard the mailman yelling at the cat from upstairs. 
 Original Ending: I ran downstairs to grab the cat. When I picked the cat up, he panicked and attacked me instead. I bought a mailbox that afternoon. 
 Counterfactual Context: I heard the mailman happily giggling at the cat from upstairs.

I ran downstairs to grab the cat. When I picked the cat up, he panicked and swatted me instead. I bought a cat crate that afternoon. 