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.

Example Input: Sentence1: Tom wanted to secure his future. Sentence2: He decided to learn how to program. Sentence3: He google searched for days to determine the best language. Sentence4: He decided that Ruby was the best programming language for him. Sentence5: He bought books on Ruby and worked hard, he learned Ruby well.
Example Output: Tom

Example Input: Sentence1: Jayla was browsing at the library with her son. Sentence2: There was a man at the library. Sentence3: The man was in the children's section. Sentence4: He was staring at the children. Sentence5: Jayla told the clerk to watch the man.
Example Output: Clerk, Jayla, Children, Her son, A man

Example Input: Sentence1: We used to eat frozen pizzas regularly. Sentence2: One day my wife felt unwell after eating a frozen pizza. Sentence3: She got better after an hour or so. Sentence4: After that she stopped buying frozen pizzas. Sentence5: Now we order out - more expensive but better for our stomachs!
Example Output:
My wife