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.
Q: Sentence1: Despite spending hours on his homework, Ollie still wasn't finished. Sentence2: The task was to complete 10 algebra questions. Sentence3: Rather than researching the answer, Ollie guessed the answer. Sentence4: To his amazement, he got 3 right. Sentence5: This wasn't enough for a pass though, and he had to retake the test.
A:
Rather, Despite