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.

Q: Sentence1: Dennis decides he wants more hours at work. Sentence2: He decides he doesn't want to ask his boss for more hours. Sentence3: So, instead he just dawdles at night before he clocks out. Sentence4: But his boss is taking notice and tells him to stop. Sentence5: Dennis decides to ask his boss for more hours.

A: Dennis, Boss
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Q: 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.

A: Tom
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Q: Sentence1: Lisa wanted to go swimming, but the sign said the water wasn't safe. Sentence2: Lisa decided to go swimming anyway. Sentence3: She almost drowned in the current. Sentence4: Lisa made it back to the shore safely, but she learned a big lesson. Sentence5: She wouldn't swim in unsafe water again.

A:
Lisa
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