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: Lily was in a bad friendship. Sentence2: She didn't want to be in it anymore. Sentence3: So she decided to not be in it. Sentence4: It was painful. Sentence5: But it was also worth it.

Output: Lily

Input: Consider Input: Sentence1: Christina converted to Islam when she was in college. Sentence2: Before she converted, she read a lot about Islam. Sentence3: She found out that Muslims should not have names like hers. Sentence4: Christina means follower of Christ which is not in line with Islam. Sentence5: Christina changed her name to Charity.

Output: Christina, Charity

Input: Consider Input: Sentence1: A man went to a katare school to take lessons. Sentence2: The sensei asked him what sort of belt he was. Sentence3: The man did not understand and told him he was a leather belt. Sentence4: The man took off his belt and tried to use it to attack the sensei. Sentence5: The sensei blocked the attack and punched the foolish man.
Output: Sensei, School, Man