Given the task definition and input, reply with output. In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.

Sentence1: A shepherd counted his flock one evening. Sentence2: He had several more sheep than he had had that morning. Sentence3: He checked the brands, to see to whom the new sheep belonged. Sentence4: They had no brands, though.
He never did figure out where the new sheep came from.