Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Sentence1: Joy doesn't know how to play chess but has always wanted to learn. Sentence2: Her grandfather has a chess board and knows how to play. Sentence3: Joy calls him up and he tells her to come over to play. Sentence4: He teaches Joy to play chess and they play for hours. Sentence5: Joy got to learn a new game and bond with her grandfather.
Student:
Joy, Her grandfather