Detailed 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.
Q: Sentence1: Olivia's closet door was always breaking. Sentence2: She discovered that a white piece kept breaking off. Sentence3: She was able to stick the white piece on very tightly. Sentence4: Then, she tried to fix the door. Sentence5: This time, it stopped breaking.
A:
Olivia