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 elete 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 the rightmost character from both s1 and s2 will result in three equal strings.

Example 2:
Input: s1 = "dac", s2 = "bac", s3 = "cac"
Output: -1
Explanation: Since the first letters of s1 and s2 differ, they cannot be made equal.

Constraints:
1 <= s1.length, s2.length, s3.length <= 100
s1, s2 and s3 consist only of lowercase English letters.

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