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: 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