Instructions: In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Input: Sentence1: Ollie had bought a video game. Sentence2: He didn't end up liking it much. Sentence3: He decided to take it back to the store. Sentence4: There, he chose a new game to replace it. Sentence5: The new game was much better.
Output:
Ollie