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.

Example Input: Sentence1: John was at home thinking about what to eat for dinner. Sentence2: He went to the fridge and looked inside. Sentence3: He saw that he had some fish. Sentence4: John cooked the fish in a frying pan. Sentence5: He ate the fish for dinner.
Example Output: John

Example Input: Sentence1: June worked at a tape factory. Sentence2: She didn't think her job was very rewarding. Sentence3: She decided to leave her job. Sentence4: She decided to be an entrepreneur. Sentence5: She made a million dollars.
Example Output: June

Example Input: Sentence1: Ian bought some seedlings to plant in his new garden. Sentence2: Ian also underestimated the work and time involved in moving. Sentence3: The seedlings sat around much longer than they should have. Sentence4: He knew they'd probably be stunted but he planted them anyway. Sentence5: The herbs all did fine but he never did get any tomatoes!
Example Output:
Ian