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.

Sentence1: A friend of mine is always testing his luck with the law. Sentence2: He rather sell drugs than get a job. Sentence3: The last I heard is he started to traffic across state lines. Sentence4: Yesterday the DEA came looking for him. Sentence5: Later in the evening news he was arrested with drugs.
I (myself), Dea, Friend

Sentence1: My science class took a field trip to the bio park today. Sentence2: Only about half of the students were allowed to go on the trip. Sentence3: My best friend Mark got left behind because he failed a math test. Sentence4: That doesn't seem fair to me because he is really good at science. Sentence5: I don't understand why teachers punish students who really try hard.
Students, I (myself), Teachers, Mark

Sentence1: Sam wanted to look good in his new shoes. Sentence2: He installed fancy new shoe laces in the shoes. Sentence3: The laces changed color in the sun and glowed in the dark. Sentence4: He went outside to test them out. Sentence5: The laces turned into a rainbow and he was happy for the day.
Sam