Given the task definition and input, reply with output. 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: Glen needed groceries but his car was at the mechanic's. Sentence2: He began to walk to the store when he felt very tired. Sentence3: He walked through the store and struggled getting his items. Sentence4: After checking out, Glen began the laborious long walk home. Sentence5: Glen finally made it home and rested for a long time.
Glen, The mechanic