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: For years, Martin has been trying to think of the next big invention. Sentence2: Finally, he had a breakthrough. Sentence3: Martin built a prototype of a bowl that separates the cereal and milk. Sentence4: He pitched his idea to several flatware companies. Sentence5: The executives rejected Martin's new invention.
Output:
Flatware companies, Executives, Martin