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 wife hates her job. Sentence2: She is a teacher to sixth graders and she always gets headaches. Sentence3: She complains that they are way to loud and don't listen. Sentence4: She asked the principal if she could teach at the high school level. Sentence5: The principal allowed her to switch to the junior year, she's happy.

Output: I (myself), School, Principal, Sixth graders, Wife

Input: Consider Input: Sentence1: For mother's day Jane cooked her mother's favorite meal. Sentence2: It is Italian spaghetti with garlic bread. Sentence3: She spent several hours cooking it. Sentence4: Her mom eat it. Sentence5: She loved it.

Output: Jane, Mother

Input: Consider Input: Sentence1: Mike wanted to start his own NFL football collection. Sentence2: Mike did research using google to find out which footballs had value. Sentence3: Mike logged onto E-bay and bought an autographed football. Sentence4: Mike had a display case built in his home to display his collection. Sentence5: Mike now has the beginnings of a great NFL football collection.
Output: Mike