Problem:
Score : 100 points

Problem Statement

The door of Snuke's laboratory is locked with a security code.

The security code is a 4-digit number. We say the security code is hard to enter when it contains two consecutive digits that are the same.

You are given the current security code S. If S is hard to enter, print Bad; otherwise, print Good.

Constraints

S is a 4-character string consisting of digits.

Input

Input is given from Standard Input in the following format:

S

Output

If S is hard to enter, print Bad; otherwise, print Good.

Sample Input 1

3776

Sample Output 1

Bad

The second and third digits are the same, so 3776 is hard to enter.

Sample Input 2

8080

Sample Output 2

Good

There are no two consecutive digits that are the same, so 8080 is not hard to enter.

Sample Input 3

1333

Sample Output 3

Bad

Sample Input 4

0024

Sample Output 4

Bad

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;

namespace A_Security
{
    class Program
    {
        static void Main(string[] args)
        {
            string num = Console.ReadLine();
            char[] array = new char[4];

            for (int i = 0; i < 4; i++)
            {
                array[i] = num[i];
            }

            int[] num2 = new int[4];

            for (int i = 0; i < 4; i++)
            {
                num2[i] = int.Parse(Convert.ToString(array[i]));
            }

            if (num2[0] == num2[1] ||
                num2[1] == num2[2] ||
                num2[2] == num2[3]
               )
            {
                Console.WriteLine("bad");
            }
            else
            {
                Console.WriteLine("good");
            }


        }
    }
}