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: Gina's mom promised her that she would buy pizza. Sentence2: She came home with a box. Sentence3: Gina immediately took it and went to the kitchen. Sentence4: She opened it. Sentence5: She was sad when she found out that one piece was there.
Output:
Gina's mom, Gina