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: Kristi loved to go hiking in the mountains. Sentence2: One day she was alone on the trail when she heard a low growl. Sentence3: Slowly turning around she saw a mountain lion crouching down. Sentence4: Kristi had been a girl scout so she knew what to do. Sentence5: Hands in her pockets, she lifted her arms high to seem bigger.
Kristi, Mountain lion