Q: In this task, you're given four sentences of a story written in natural language in which one part is missing. Your job is to predict the position and missing part of the story and return in the following format: position, missing part. The missing part is a sentence that completes the story, and the position is the number of the missing sentence in the new story.
Sentence1: The suspect saw that the cell door was unlocked. Sentence2: He pushed on it and it opened. Sentence3: No one was watching him so he made an escape. Sentence4: He calmly walked out of the front of the police station.
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
5, No one seemed to notice the suspect.