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.

[EX Q]: Sentence1: Riley had always enjoyed playing board games. Sentence2: One day he decides to play chess with a friend. Sentence3: It was a difficult game. Sentence4: In the end, Riley lost the chess game. Sentence5: However, he still loved board games.
[EX A]: A friend, Riley

[EX Q]: Sentence1: Sam wanted to learn how to read. Sentence2: He thought his friends would mock his illiteracy. Sentence3: But when they found out, they were all very kind. Sentence4: They even volunteered to teach him his letters. Sentence5: After months of studying, Sam became a great reader!
[EX A]: His friends, Sam

[EX Q]: Sentence1: Everyone on the island knew something was up. Sentence2: The volcano had been smoking for about a week. Sentence3: The islanders knew it was time to go and they evacuated. Sentence4: The volcano began smoking even more. Sentence5: Finally the top of the mountain blew off in a huge eruption.
[EX A]:
The islanders, Everyone