2937. Make Three Strings Equal

You are given three strings: s1, s2, and s3. In one operation you can choose one of these strings and delete its rightmost character. Note that you cannot completely empty a string. Return the minimum number of operations required to make the strings equal. If it is impossible to make them equal, return -1. Example 1: Input: s1 = "abc", s2 = "abb", s3 = "ab" Output: 2 Explanation: Deleting