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.

Example Input: Sentence1: Thomas went out with his friends on Halloween. Sentence2: They decided to look for ghosts. Sentence3: It was dark and spooky, and Thomas wasn't sure he wanted to go. Sentence4: They did not find a single ghost! Sentence5: Still, he was glad to have spent time with his friends.
Example Output: Thomas, Friends

Example Input: Sentence1: Linda was intrigued by music of all sorts. Sentence2: She particularly enjoyed guitar solos. Sentence3: Linda dreamed of being able to play the guitar. Sentence4: She bought a guitar at a local pawn shop. Sentence5: Linda can now play all of her favorite songs.
Example Output: Linda

Example Input: Sentence1: Tim loved to listen to songs. Sentence2: His favorite music was folk. Sentence3: Tim wanted to learn to play folk music. Sentence4: Tim went to many concerts and shows. Sentence5: Tim tried his hand at folk music and was pretty good at it.
Example Output:
Tim