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: Mason made a deal that he could have a phone if he saved up for it. Sentence2: He spent the summer doing odd jobs to save up cash. Sentence3: When he finally saved enough, he went out to the store to look. Sentence4: The new iPhone caught his eye immediately. Sentence5: He walked out of the store already texting his friends.
Mason,s friends, Mason