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: Brad was looking forward to a rock concert. Sentence2: He bought tickets early. Sentence3: He was going to meet all his friends there. Sentence4: ON the weekend of the show he got in trouble. Sentence5: Brad was grounded and missed the concert.
Output:
Friends, Brad