Given the task definition and input, reply with output. 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.

Sentence1: Melinda was walking towards the grocery store. Sentence2: On her way, she encountered a four-leaf clover. Sentence3: She remembers that four-leaf clovers are supposed to be lucky. Sentence4: She decides to buy a lottery ticket to test if it's true. Sentence5: Unfortunately, she doesn't win the prize.

Melinda