using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int[,] index= new int[10,10];

        int start=3;

        int[] arr= {1,2,3,4,5,6,7,8,9,0};

        Program obj= new Program();

        int attempt=0;

        Console.WriteLine("Please Enter a 3 digit number");

        passkeyagain:

        int passkey=Convert.ToInt32(Console.ReadLine()) ;

        if(passkey.ToString().Length!=3)

        {

        Console.WriteLine("\nPlease enter a valid 3 digit number");

            goto passkeyagain;

        }

        var password=  obj.inttoarray(passkey);

        Console.WriteLine("\nEnter a position number(between 0-9)");

        positionagain:

        int position=Convert.ToInt32(Console.ReadLine()) ;

        if(position.ToString().Length!=1)

        {

        Console.WriteLine("\nPlease enter a valid  position number(between 0-9)");

            goto positionagain;

        }

        Console.WriteLine("\nYour password is saved successfully\n\n  ");

        Console.WriteLine("\n Now we are going to set up secret questions. This will help incase your account is locked.");

        //string C=Console.ReadLine().ToUpper();

        Console.WriteLine("\n 1) What is your favourite city\n");

        string city= Console.ReadLine().ToUpper();

        Console.WriteLine("\n 1) What is your favourite colour\n");

        string color=Console.ReadLine().ToUpper();

        Console.WriteLine("\nCongratulations.Now you can go for login \n\n  ");

        goto loginagain;

        unlockagain:

        Console.WriteLine("\n 1) What is your favourite city\n");

        string City1= Console.ReadLine().ToUpper();

        Console.WriteLine("\n 1) What is your favourite colour\n");

        string Color1=Console.ReadLine().ToUpper();

        if(City1==city && Color1==color)

        {

            Console.WriteLine("\n Account is unlocked\n\n");

            attempt=0;

            goto loginagain;

        }

        //assigning values 

        loginagain:

        Console.WriteLine("\n Please enter grid pin\n\n");

        for (int i=0;i<10;i++)

        {

            int k=0;

            for (int j=0;j<10;j++)

            {

                if(start>9) 

                {  

                    if(k>9){k=0;}

                    start=arr[k];

                    k++;

                }

                index[i,j]=start;

                start++;

            }

        }

        //display 

        //here:

        for (int i=0;i<10;i++)

        {

            Console.Write(i+" ");

            for (int j=0;j<10;j++)

            {

                Console.Write(index[i,j]+" ");

            }

            Console.WriteLine();

        }

        gridpinagain:

        if(attempt==3)

        {

            Console.WriteLine("\nSorry you made 3 wrong attempts.Account is locked.Type and enter as shazam for unlocking account");

            string unlock=Console.ReadLine().ToUpper();

            if(unlock=="SHAZAM")

            goto unlockagain;

        }

        else

        {

        int gridpin=Convert.ToInt32(Console.ReadLine()) ;

        // password validation

        int[] res= new int[3];

        for(int k=0;k<3;k++)

        {

            int i= password[k];

            res[k]= index[i,position-1];

        }

        int f_res=obj.arraytoint(res);

        if (gridpin==f_res)

        {

            Console.WriteLine("\n Correct Gridpin . You have logged in");

            Console.WriteLine("\n if you want to log off ,please type and enter as logoff");

            string logoff=Console.ReadLine().ToUpper();

            if(logoff=="LOGOFF")

            goto loginagain;

        }

        else 

        {

            attempt++;

            if(attempt<3)

            {

            Console.WriteLine("\n Wrong Gridpin (Attempt:"+attempt+") Please try again");

            goto gridpinagain;

            }

            else 

            {

                goto gridpinagain;

            }

        }

        }

    }

    public int[] inttoarray(int num)

    {

        List<int> digits = new List<int>();

        int n=num;

        for (;n!=0;n/=10)

        {

            digits.Add(n % 10);

        }

    var arr = digits.ToArray();

    Array.Reverse(arr);

    return arr;

    }

    public int arraytoint(int[] num)

    {

        int n=0;

        for (int i=0;i<num.Length;i++)

        { 

            n= n*10+num[i];

        }

        return n;

    }

}