You will be given a definition of a task first, then some input of the task.
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.

Sentence1: Charles worked hard at his internship. Sentence2: During his last days at his internship, he tried not to make mistakes. Sentence3: For the final project he had to take a picture working with his boss. Sentence4: His boss stood in front of him and looked down. Sentence5: Charles looked up and smiled but their lips almost touched.
Output:
Charles, Boss