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: Jacob was excited for the rock concert his friend invited him to. Sentence2: He was dressed head to toe in his hardest headbanging gear. Sentence3: His friend was dressed in jeans and a cowboy hat. Sentence4: They drove to a country bar to see a country band. Sentence5: Jacob could only laugh about how his friend had tricked him.
Output:
Jacob, His friend