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: Maggie's 60th Birthday is approaching. Sentence2: She is fearful of growing old. Sentence3: Watching a commercial she sees an anti-aging cream. Sentence4: Maggie reaches into her purse for her credit card. Sentence5: She purchases the cream as a birthday gift to herself.
Example Output: Maggie

Example Input: Sentence1: Jennifer wanted to organize her living room. Sentence2: She bought a tall bookshelf to contain the clutter. Sentence3: She put some cute knick knacks on it as well. Sentence4: Jennifer felt like her living room was really coming together. Sentence5: She liked having a clean, organized space!
Example Output: Jennifer

Example Input: Sentence1: Simon wanted to watch his favorite show. Sentence2: He tried to access it through On Demand. Sentence3: The TV kept returning an error message. Sentence4: He asked his mom to call the cable company's customer service number. Sentence5: After a short phone call, the cable company fixed the problem.
Example Output:
Simon, Mom