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: Jill was trying to study for her algebra class. Sentence2: But she was very impatient. Sentence3: She tried to skip steps and take shortcuts. Sentence4: But she only became more frustrated when she got the wrong answers. Sentence5: Jill quickly declared she was bad at math and gave up.
Jill