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: Gene was on a vacation in Vietnam. Sentence2: He began to walk down the streets to get food. Sentence3: He suddenly noticed a young man taking pictures of him. Sentence4: Gene called out for him to stop and chased after him. Sentence5: The man ran away and took off with the pictures.
Output:
Gene, A young man