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: Susanna really wanted an iPhone. Sentence2: She wanted it mainly for the Touch ID. Sentence3: She thought it would be cool to have. Sentence4: So she went and bought one. Sentence5: She couldn't have been happier with her purchase.
Susanna