Q: 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: Part of Mark's job was to train all the new people at the restaurant. Sentence2: Today Mark had to train Gina to be the hostess. Sentence3: She was shy on the phones and wasn't polite greeting guests. Sentence4: Mark decided that she was not cut out for this job so he fired her. Sentence5: Gina was sad and vowed to find a job she is good at.
A:
Gina, People, Mark