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: Paul took his son to school. Sentence2: But he forgot to give him a lunch. Sentence3: So his son shared food with his friend. Sentence4: But the food made him sick. Sentence5: And Paul never let his son eat school food again.
Student:
Paul, His friend, His son