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: Gary went for a bike ride on the river trail. Sentence2: He saw an object on the ground so he stopped to look. Sentence3: The object was a wallet with a picture and a driver's license inside. Sentence4: Gary sent the wallet through the mail to the address on the license. Sentence5: The man called Gary to thank him for sending his wallet to him.
Man, Gary