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: My girlfriend and I went out for a walk. Sentence2: We walked down our street in the rain. Sentence3: While walking we stepped in a deep muddy puddle. Sentence4: We slipped and got covered by mud. Sentence5: After that we went home and cleaned up.
I (myself), Girlfriend