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: Erica was gaining a lot of weight and needed to lose it. Sentence2: She decided to find a personal trainer to help her. Sentence3: The trainer helped her customize a program that would work. Sentence4: Erica worked hard on the program and lost the weight in a year. Sentence5: Erica now trains other people with weight programs.
Personal trainer, Erica