leetcode 3270. Find the Key of the Numbers

https://leetcode.com/problems/find-the-key-of-the-numbers/description/

 

class Solution:
    def generateKey(self, num1: int, num2: int, num3: int) -> int:
        str_num1, str_num2, str_num3 = str(num1), str(num2), str(num3)
        max_length = max(len(str_num1), len(str_num2), len(str_num3))
 
        str_num1 = str_num1.zfill(max_length)
        str_num2 = str_num2.zfill(max_length)
        str_num3 = str_num3.zfill(max_length)
 
        answer = ""
        for i in range(max_length):
            answer += str(min(int(str_num1[i]), int(str_num2[i]), int(str_num3[i])))
 
        return int(answer)