system
Abide by your designation. Offer expert assistance to the user.
human
Add a comma to the following sentence to create clearer meaning: "He enjoyed camping hiking and fishing."

Relevant data:
After a long day at work, David enjoys retreating to the mountains where he can enjoy camping, hiking, and fishing alone.
gpt
After a long day at work, David enjoys retreating to the mountains where he can enjoy camping, hiking, and fishing alone.