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: Alan was riding the subway home from work. Sentence2: He got engrossed in his newspaper. Sentence3: He didn't even notice when the subway passed his stop! Sentence4: By the time he realized, it was too late.

Alan had to walk back four blocks.