Detailed Instructions: 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.
Q: Sentence1: My dorm mates were incredible pranksters. Sentence2: One day they filled a thirty gallon Rubbermaid trash can with water. Sentence3: The opened the laundry room door, propping the can on the door's top. Sentence4: As the floor manager entered the laundry room, they nudged the door. Sentence5: The entire thirty gallons poured down on the manager in an icy flood!
A:
I (myself), Manager, Mates