Definition: 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.
Input: Sentence1: Sean rode a bike to work. Sentence2: He always parked the bike out back near the trash. Sentence3: One night, he came out to find his bike gone. Sentence4: They watched the security tapes.

Sean saw that his bike had been stolen by a masked man.