Given the task definition and input, reply with output. In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.

Sentence1: One day, my dog would not stop barking. Sentence2: We went outside to see what he was barking at. Sentence3: Suddenly, we saw a snake on our front porch. Sentence4: The dog was going nuts!
Finally, the snake left.