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: Every Tuesday I meet my grandfather for coffee. Sentence2: He usually spends hours talking about his projects. Sentence3: This week he was rather quiet. Sentence4: He said he was tired because he stayed up too late watching television Sentence5: Our coffee time ended early so he could go home and take a nap.
Output:
I (myself), Grandfather