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: One day, police were investigating a crime scene. Sentence2: They were stuck on where to go next. Sentence3: They got a tip to check behind the library. Sentence4: There they found some key evidence.

The police found the perpetrator and locked her up.