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.
Input: Sentence1: Saul wants to go hunting. Sentence2: His father is planning a trip for him. Sentence3: Saul has no clue he is going hunting. Sentence4: The trip is planned on his birthday, which is on Monday. Sentence5: Saul is excited when he finds out what his hunting trip is.
Output:
Father, Saul