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: Alex purchased a bag of chips for his girlfriend at the store. Sentence2: When she received it, she opened it and started to eat. Sentence3: The pieces were stale. Sentence4: She checked for any holes in the bag. Sentence5: Surprisingly, she didn't see any holes.
A:
Girlfriend, Alex