using System;

public class Program
{
    class Person
    {
        public int age = 20;
    }

    public static char convert(int[] cells, int i)
    {
        if (cells[i] == -1)
            return ' ';
        else if (cells[i] == 0)
            return '0';
        else
            return 'x';
    }

    public static void drawboard(int[] cells)
    {
        Console.WriteLine($"       |    |   ");
        Console.WriteLine("  {0}    | {1} | {2}  ", convert(cells, 0), convert(cells, 1), convert(cells, 2));
        Console.WriteLine($" ______|____|______    ");
        Console.WriteLine($"       |    |            ");
        Console.WriteLine("   {0}   | {1} | {2}    ", convert(cells, 3), convert(cells, 4), convert(cells, 5));
        Console.WriteLine($" ______|____|______          ");
        Console.WriteLine($"       |    |             ");
        Console.WriteLine("   {0}   | {1} | {2}              ", convert(cells, 6), convert(cells, 7), convert(cells, 8));
        Console.WriteLine($"       |    |                ");
    }

    public static bool isCellEmpty(int index, int[] array)
    {
        return array[index] == -1;
    }

    public enum winstate
    {
        xwin,
        owin,
        tie,
        none,

    }

    public static bool iswin(bool turn, int[] cells, int a, int b, int c)
    {
        int choice = turn ? 0 : 1;
        return cells[a] == choice && cells[b] == choice && cells[c] == choice;
    }


    public static winstate checkwin(bool turn, int []cells)
    {
        winstate state = winstate.none;

        if(turn == true)
        {
            state = winstate.owin;
        }
        else
        {
            state = winstate.xwin;
        }

        if (iswin(turn, cells, 0,1,2))
        {
            return state;
        }
        else if(iswin(turn, cells, 3, 4, 5))
        {
            return state;
        }
        else if (iswin(turn, cells , 6, 7 ,8))
        {
            return state;
        }
        else if (iswin(turn,cells,0,3,6))
        {
            return state;
        }
        else if (iswin(turn,cells,1,4,7))
        {
            return state;
        }
        else if (iswin( turn,cells,2,5,8))
        {
            return state;

        }
        else if (iswin( turn ,cells, 0,4,8))
        {
            return state;

        }
        else if (iswin(turn, cells, 2,4,6))
        {
            return state;
        }

        return winstate.none;
    }

    public static void Main()
    {
        bool turn = false;
        int[] cells = new int[] { -1, -1, -1, -1, -1, -1, -1, -1, -1 };
        while (true)
        {
            Console.Clear();
            drawboard(cells);
            string a = Console.ReadLine();
            int num = int.Parse(a);
            if (isCellEmpty (num, cells))
            {
                if (turn)
                {
                    cells[num] = 0;
                    turn = false;
                }
                else
                {
                    cells[num] = 1;
                    turn = true;
                }
            }
        }
    }
}