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: Ahmed has always loved ice cream. Sentence2: He used to sell ice cream sandwiches on the playground. Sentence3: He knew one day he'd open an ice cream parlor. Sentence4: After selling enough ice cream, he finally bought a shop. Sentence5: He could finally sell his ice cream sandwiches from inside a building.
Ahmed