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: Joe needed help with a gift idea for his mom. Sentence2: Christmas was coming up and he had no idea what to buy her. Sentence3: So he asked his dad for a suggestion. Sentence4: His dad suggested that Joe buy her a scented candle. Sentence5: Joe followed the advice and bought his mom a lovely candle!
Output:
Dad, Joe, Mom