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: My dad gave me a gift card. Sentence2: I was excited to use it! Sentence3: Alas, I lost it and couldn't find it. Sentence4: I was preparing to tell my dad what happened. Sentence5: Suddenly, I found the gift card in my back pocket!
Output:
Dad, I (myself)