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: I just completed my first marathon today. Sentence2: It was about six miles and I worked real hard. Sentence3: I trained for it for about three months. Sentence4: It's always been on my to do list in life

I've never been happier.