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: Consider Input: Sentence1: My friend and I were bored yesterday. Sentence2: My friend suggested we play a video game. Sentence3: We decided to bet money on a video game. Sentence4: He beat me badly, but it was fun. Sentence5: I am upset I lost my money, but it was worth it.

Output: I (myself), My friend

Input: Consider Input: Sentence1: Tre's bicycle really needed new brakes. Sentence2: Tre saved up all his allowance to take his bike to the shop. Sentence3: On the way a teenager jumped Tre and stole all his money and his bike. Sentence4: Tre walked home crying and empty handed. Sentence5: When he got there he found his mother dead.

Output: A teenager, His mother, Tre

Input: Consider Input: Sentence1: Michael was trying out for his college football team. Sentence2: He missed a few passes in the tryout. Sentence3: Michael didn't make the team. Sentence4: Michael decided to spend more time focusing on his studies instead. Sentence5: Michael graduated with honors.
Output: Michael