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: Paul felt brave so he tried to join the Army. Sentence2: The Army said he was too weak to join. Sentence3: Paul was undeterred so he then tried to join the Navy. Sentence4: The Navy refused him because Paul couldn't swim.

Paul was very frustrated.