New to python

So after figuring out the number.length mission, I get to this and this feels even more vague than the last. I have no prior experience with coding, and I am struggling to figure out what it is that I am using the string function for and then what to print/return after said string function. I have tried a few different methods that I learned from the previous mission but am not having any luck.

def end_zeros(num: int) -> int:
    # your code here
    str(num)
    return end_zeros

this is what I have and I understand it is wrong, but have no clue where to start.