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: Consider Input: Sentence1: Zaddy Tracks is a black cat. Sentence2: He is over ten years old. Sentence3: Last spring he got very sick. Sentence4: He went to the veterinarian who gave him some pills for his liver. Sentence5: Zaddy Tracks got better.

Output: Zaddy, Veterinarian

Input: Consider Input: Sentence1: Tony went to the park to see friends. Sentence2: They found an open field to play in. Sentence3: They all played soccer and Tony was the goalie. Sentence4: Tony made a big save to help his team win. Sentence5: All his friends cheered Tony for his great save.

Output: Tony, Friends

Input: Consider Input: Sentence1: Tom was driving home from work. Sentence2: He noticed smoke coming out from under his hood. Sentence3: Tom decided to pull over. Sentence4: He got out right as the fire raged. Sentence5: His car was completely consumed within minutes.
Output: Tom