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: Paula always enjoyed going to the lake with her grandpa. Sentence2: They would skip stones for hours on end. Sentence3: She got the news one day that her grandpa was sick. Sentence4: Paula was sad when she heard he had passed. Sentence5: She went to the lake and skipped stones, thinking of her grandpa.
A:
Grandpa, Paula