leetcode 2937. Make Three Strings Equal

https://leetcode.com/problems/make-three-strings-equal/description/

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class Solution:
    def findMinimumOperations(self, s1: str, s2: str, s3: str) -> int:
        common_prefix = ''
        for i in range(min(len(s1), len(s2), len(s3))):
            if s1[i] == s2[i] and s2[i] == s3[i]:
                common_prefix += s1[i]
            else:
                break
        cnt = len(s1) + len(s2) + len(s3) - len(common_prefix) * 3
        if common_prefix == '' :
            return -1
        else:
            return cnt