Given the task definition and input, reply with output. 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: O'shea was in the 7th grade when he was almost shot. Sentence2: He was on his school bus heading home and a friend made gang signs. Sentence3: The car next to the bus was full of gang members. Sentence4: The car sped up, got in front of the bus and stopped it. Sentence5: A gang member got on the bus with a gun and threatened to shoot.
Gang members, Gang member, Friend, O'shea