05. Knight Path

using System;

class KnightPath
{
    static void Main()
    {
        int[] numbers = new int[8];

        for (int i = 0; i < numbers.Length; i++)
        {
            numbers[i] = 0;
        }

        string input = Console.ReadLine();

        int currentNumber = 0;
        int position = 0;

        numbers[currentNumber] = 1;
        while (input != "stop")
        {

            string[] inputAsArray = input.Split();

            string firstCommand = inputAsArray[0];
            string secondCommand = inputAsArray[1];


            if (firstCommand == "left" && secondCommand == "up")
            {
                if (position + 2 <= 7 && currentNumber - 1 >= 0)
                {
                    position += 2;
                    currentNumber--;
                }
            }
            else if (firstCommand == "left" && secondCommand == "down")
            {
                if (position + 2 <= 7 && currentNumber + 1 <= 7)
                {
                    position += 2;
                    currentNumber++;
                }
            }
            else if (firstCommand == "right" && secondCommand == "up")
            {
                if (position - 2 >= 0 && currentNumber - 1 >= 0)
                {
                    position -= 2;
                    currentNumber--;;
                }
            }
            else if (firstCommand == "right" && secondCommand == "down")
            {
                if (position - 2 >= 0 && currentNumber + 1 <= 7)
                {
                    position -= 2;
                    currentNumber++;
                }
            }
            else if (firstCommand == "up" && secondCommand == "left")
            {
                if (position + 1 <= 7 && currentNumber - 2 >= 0)
                {
                    position++;
                    currentNumber -= 2;
                }
            }
            else if (firstCommand == "up" && secondCommand == "right")
            {
                if (position - 1 >= 0 && currentNumber - 2 >= 0)
                {
                    position--;
                    currentNumber -= 2;
                }
            }
            else if (firstCommand == "down" && secondCommand == "left")
            {
                if (position + 1 <= 7 && currentNumber + 2 <= 7)
                {
                    position++;
                    currentNumber += 2;
                }
            }
            if (firstCommand == "down" && secondCommand == "right")
            {
                if (position - 1 >= 0 && currentNumber + 2 <= 7)
                {
                    position--;
                    currentNumber += 2;
                }
            }
            if (((numbers[currentNumber] >> position) & 1) == 0)
            {
                numbers[currentNumber] ^= (1 << position);
            }

            input = Console.ReadLine();
        }

        bool zeroBoard = true;

        foreach (int number in numbers)
        {
            if (number != 0)
            {
                Console.WriteLine(number);
                zeroBoard = false;
            }
        }

        if (zeroBoard)
        {
            Console.WriteLine("[Board is empty]");
        }
    }
}