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: Today was such as long day. Sentence2: My boss had so many high demands. Sentence3: When he asked me to work overtime I couldn't refuse. Sentence4: I poured myself an extra cup of coffee. Sentence5: It will be a long night, here in the office.
Output:
I (myself), Boss