public static string Test()
        {
            var p = new[] {"1", "2"};
            foreach (var s in p)
            {
                int hor = 0, vert = 0, dig1 = 0, dig2 = 0;
                for (int i = 0; i < 3; i++)
                {
                    if (a[i, i] == s) ++dig1;
                    if (a[i, 2 - i] == s) ++dig2;
                    for (int j = 0; j < 3; j++)
                    {
                        if (a[i, j] == s) ++hor;
                        if (a[j, i] == s) ++vert;
                    }
                    if (hor == 3 || vert == 3) return s=="1"?"X":"0";
                    hor = 0;
                    vert = 0;
                }
                if(dig1 == 3 || dig2 == 3)
                        return s=="1"?"X":"0";
            }
            return "";
        }