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: When my friends play video games, I usually win. Sentence2: We set up an unofficial tournament this past Saturday. Sentence3: I played nonstop for almost an entire week to get ready. Sentence4: On the day of the event, I won every round until the finals. Sentence5: For the first time, David beat me claiming the top spot.
I (myself), My friends, David