回文数索引

import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int len = sc.nextInt();
        for(int i=0;i<len;++i){
            String str = sc.next();
            System.out.println(result(str));

        }
    }

public static int result(String str){
        char[] arrayA = str.toCharArray();
        int top = 0;
        int end = arrayA.length-1;
        while(top < end){
            if(arrayA[top++] != arrayA[end--]){
                if(arrayA[top-1] == arrayA[end]){
                    return end+1;
                }else if(arrayA[top] == arrayA[end+1]){
                    return top-1;
                }
            }
        }
        return -1;
    }
}