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: 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.
Tony, Friends

Sentence1: Carlos always loved being near the water. Sentence2: His friend invited him to go sailing one day. Sentence3: Carlos and his friend spent the entire day sailing. Sentence4: It was a great day. Sentence5: Carlos was happy that he had spent the day on the water.
Friend, Carlos

Sentence1: Paul decided to find out about his birth parents. Sentence2: He asked his adoptive parents about them. Sentence3: They told him his mother had been a prostitute. Sentence4: Paul looked at them stunned. Sentence5: He decided not to ask them who his father had been.
Paul, Adoptive parents, Father, Birth parents, Mother