Raw seconds are hard to read in an interface, so they are usually converted into years, days, hours, minutes, and seconds. Write format_duration, which takes a non-negative number of seconds and returns a clean English phrase. Use 1 year = 365 days, choose the correct singular or plural forms, separate parts with commas, and place and before the final part. For 0, return now.

def format_duration(seconds: int) -> str: