Detailed Instructions: 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: Gina was waiting in an office with lots of windows at her school. Sentence2: She had been there for hours. Sentence3: Class was letting out, and the halls were full of kids. Sentence4: There was a knock on the glass. Sentence5: Gina perked up when she saw her friends waving to her.
A:
Gina, Her friends, Kids