Q: 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: Mary's grandparents were coming to see her play soccer. Sentence2: She was worried because she was not very good. Sentence3: Mary practiced all week in preparation for her big game. Sentence4: Her grandparents came to see her. Sentence5: Mary's practice helped her to be the one to score the winning goal.
A:
Mary, Mary's grandparents