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: Chelsea loves pandas. Sentence2: Her parents took her to the zoo. Sentence3: Chelsea looked for the pandas all around the zoo. Sentence4: A zoo keeper told her that they did not have any pandas. Sentence5: Chelsea was in tears for the rest of the day.
Output:
Zoo keeper, Chelsea, Chelsea's parents