[Python] Trying to loop through a str array and convert elements to integers

I am working on a simple problem where I sort exactly three integers in ascending order. Here's what I have written:

import stdio
import sys

nums = sys.argv
idxLow = min(nums).index
idxHigh = max(nums).index
numMid = 0

for i in nums:
i = int(float(i))

if i != idxLow and i != idxHigh:
numMid = int(float(nums))

stdio.write(nums[idxLow] + " " + numMid + " " + nums[idxHigh])


I keep getting ValueErrors, and no matter where I cast, the elements of the nums array, despite being integers, still return errors.

Input: python three_sort.py 9 2 4

Restrictions: can only use the stdio and sys libraries, can only use min(), max(), and basic arithmetic

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