bit chess

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CurrencyCheck
{
    class Bits
    {
        static void Main(string[] args)
        {
            long[] board = new long[8];
            string input = Console.ReadLine();
            int line = 0;
            int pos = 0;
            board[line] ^= (1 << pos);
            while (input != "stop")
            {
                bool toContinue = false;
                int previousLine = line;
                int previousPos = pos;
                switch (input)
                {
                    case "left down":
                        line++;
                        pos += 2;
                        break;
                    case "down right":
                        line += 2;
                        pos--;
                        break;
                    case "right up":
                        pos -= 2;
                        line--;
                        break;
                    case "down left":
                        line += 2;
                        pos++;
                        break;
                    case "left up":
                        line--;
                        pos += 2;
                        break;
                    case "up left":
                        line -= 2;
                        pos++;
                        break;
                    case "up right":
                        line -= 2;
                        pos--;
                        break;
                    default:
                        toContinue = true;
                        break;
                }
                if (toContinue)
                {
                    input = Console.ReadLine();
                    continue;
                }
                if (line >= 8 || pos >= 8 || line < 0 || pos < 0)
                {
                    line = previousLine;
                    pos = previousPos;
                }
                else
                {
                    board[line] ^= (1 << pos);
                }
                input = Console.ReadLine();
            }

            StringBuilder sb = new StringBuilder();
            for (var i = 0; i < board.Length; i++)
            {
                if (board[i] != 0)
                {
                    sb.AppendLine(board[i].ToString());
                }
            }

            if (string.IsNullOrEmpty(sb.ToString()))
            {
                Console.WriteLine("[Board is empty]");
            }
            else
            {
                Console.WriteLine(sb.ToString());
            }
        }

    }
}