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 Input:
Sentence1: Ken is a DJ for a club. Sentence2: Last night he had a really annoying patron. Sentence3: They kept asking for different songs. Sentence4: Ken kept having to turn him down. Sentence5: Eventually he just ignored him completely.

Ex Output:
Ken, Annoying patron

Ex Input:
Sentence1: Billy needed to make some money. Sentence2: He decided on Friday night he would work from home. Sentence3: Turning his computer on he realized there was a lot of work up! Sentence4: It didn't take him long to get into the swing of things. Sentence5: Before he knew it, he was working his butt off and making money.

Ex Output:
Billy

Ex Input:
Sentence1: Bob was a bodybuilder. Sentence2: He used steroids. Sentence3: He decided to sell some at his gym. Sentence4: He was caught by the gym owner. Sentence5: He was promptly kicked out of the gym for life.

Ex Output:
Gym owner, Bob