using System;

​

public class Program

{

    private static readonly byte[] workspace = new byte[30000];

    private const string source = @"++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.";

    private static int wIndex = 0;

    private static int sIndex = 0;

    public static void Main()

    {

        while (HandleFuck());

    }

​

    private static bool HandleFuck()

    {

        if (sIndex >= source.Length)

            return false;

        switch ((char)source[sIndex])

        {

            case '+':

                workspace[wIndex]++;

                break;

            case '-':

                workspace[wIndex]--;

                break;

            case '.':

                Console.Write((char)workspace[wIndex]);

                break;

            case '>':

                wIndex++;

                break;

            case '<':

                wIndex--;

                break;

            case '[':

                if (workspace[wIndex] == 0)

                    sIndex = GetMatchingLoop(forward: true);

                break;

​

            case ']':

                if (workspace[wIndex] != 0)

                {

                    sIndex = GetMatchingLoop(forward: false);

                    return true;

                }                       

                break;

            case ',':

                workspace[wIndex] = Convert.ToByte(Console.ReadKey());      

                break;

        }

        sIndex++;

        return true;

    }   

​

    private static int GetMatchingLoop(bool forward)

    {

        var depth = 0;

        var offset = forward ? 1 : -1;

        var i = sIndex + offset;

        var bad = forward ? '[' : ']';

        var good = forward ? ']' : '[';

        while(i <= source.Length && i >= 0)

        {

            if(source[i] == bad)

                depth++;

            if (source[i] == good)

            {

                if(depth != 0)

                    depth--;

                else

                    return i;

            }

            if(forward) 

                i++; 

            else 

                i--;

        }

        return 0;

    }       

}