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: I was traveling in Mexico. Sentence2: I decided to go to Mexico City. Sentence3: Little did I know how dangerous the city was. Sentence4: I was robbed in downtown Mexico City. Sentence5: I decided to leave the city to protect myself.
I (myself)