Definition: 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: Mary ordered expensive bulbs to plant in her garden. Sentence2: She spent an afternoon planting the bulbs. Sentence3: Mary couldn't wait to see the bulbs bloom into flowers. Sentence4: The next day, Mary's son came running into the kitchen. Sentence5: He showed her the 'potato' bulbs he had dug from the garden.
Output:
Mary, Mary's son