import java.util.Scanner;

public class lab10{

    //function that returns the response based on the code and guess
    public static int guess ( int[] code, int[] guess ) {

        int answer = 0;

        for ( int i = 0 ; i < 4 ; i++ )
        {
            if ( code[i] == guess[i] )
            {
                answer+=10;
                code[i] = 0;
                guess[i] = 7;

            }//end if

        }//end for


        for ( int i = 0; i < 4 ; i++ )
        {
            for ( int j = 0 ; j < 4 ; j++ )
            {
                if ( code[i] == guess[j] )
                {
                    answer++;
                    code[i] = 0;
                    guess[j] = 7;

                }//end if

            }//end inner for

        }//end outer for


        return answer;

    }//end guess


    public static int[] convert( String a ) {

        int [] answer = new int[4];

        for (int i = 0; i < 4 ; i++ )
            answer[i] = a.charAt(i);

        return answer;
    }

    public static void main ( String args[] ) {

        String a;
        String b;
        int code[];
        int guess[];


        Scanner scan = new Scanner(System.in);

        System.out.print("Please eter 4-digit code: ");
        a = scan.nextLine();

        System.out.print("Please enter a guess or 0 to stop: ");
        b = scan.nextLine();


        code = convert(a);
        guess = convert(b);

        while ( b !=  "0" )
        {

            System.out.println("Response is " + guess(code, guess));

            System.out.print("Please enter a guess or 0 to stop: ");
            b = scan.nextLine();

            guess = convert(b);

        }//end while

        System.out.println("0 entered, program terminated.");


    }//end main
}//end class