Definition: 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.
Input: Sentence1: Amy and Sue were dorm mates and enemies. Sentence2: Amy was working on an important assignment on her laptop. Sentence3: Amy hadn't realized the battery wasn't in the laptop. Sentence4: Sue intentionally tripped over the cord pulling it from the wall. Sentence5: Amy was horrified when she realized she lost all her hard work.
Output:
Amy, Sue