using System;

public class Program

{

    public static void Main()

    {

        //string genCode = "";  

        //Random r = new Random();

        //int icode = random.Next(1,100)%4 + 1;

        //while(genCode.Length<4)

        //{

        //int icode = r.Next(1,100)%4 + 1;

        //Convert.ToString(icode);

        //genCode+=icode;

        //Console.Write(icode);

        //}

        Console.WriteLine("Enter 4-digit code using 1-4;");

        string codeMaster = Console.ReadLine();

        Console.Clear();

        //Console.Write(codeMaster);

        Console.Write("guess 4-digit code using 1-4: ");

        string guess = Console.ReadLine();

        int numGuess = 10;

        while (guess != codeMaster && numGuess>1)

        {

            string guess0 = Convert.ToString(guess[0]);

            string guess1 = Convert.ToString(guess[1]);

            string guess2 = Convert.ToString(guess[2]);

            string guess3 = Convert.ToString(guess[3]);

            string hint = "";

            string code = codeMaster;

        if (code[0]==guess[0])

        { 

            code=code.Remove(0,1).Insert(0,"@");

            hint += "!";

        }

        if (code[1]==guess[1])

        {

            code=code.Remove(1,1).Insert(1,"@");

            hint += "!";

        }

        if (code[2]==guess[2])

        { 

            code=code.Remove(2,1).Insert(2,"@");

            hint += "!";

        }

        if (code[3]==guess[3])

        { 

            code=code.Remove(3,1).Insert(3,"@");

            hint += "!";

        }

            Console.WriteLine(code);

        if (code.Contains(guess0) && code[0] != '@')

        {

            int hLoc= code.IndexOf(guess0);

            code=code.Remove(hLoc,1).Insert(hLoc,"@");

            hint += "?";

        }

        if (code.Contains(guess1) && code[1] != '@')

        {

            int hLoc= code.IndexOf(guess1);

            code=code.Remove(hLoc,1).Insert(hLoc,"@");

            hint += "?";

        }

        if (code.Contains(guess2) && code[2] != '@')

        {

            int hLoc= code.IndexOf(guess2);

            code=code.Remove(hLoc,1).Insert(hLoc,"@");

            hint += "?";

        }

        if (code.Contains(guess3) && code[3] != '@')

        {

            int hLoc= code.IndexOf(guess3);

            code=code.Remove(hLoc,1).Insert(hLoc,"@");

            hint += "?";

        }

            while(hint.Length<4)

            {

                hint+="X";

            }

            Console.Clear();

            Console.WriteLine("HINT: " + hint);

            Console.WriteLine(--numGuess + " GUESSES LEFT");

            Console.Write("TRY AGAIN: ");

            guess=Console.ReadLine();

        }

        Console.Clear();

        if (guess==codeMaster)

        {

            Console.WriteLine("YOU WIN!!! " + codeMaster + " is the code!");

        } else Console.WriteLine("YOU LOSE!!! " + codeMaster + " is the code!");

    }

}