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: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;

public class Prog
{
    public void run()
    {
        string S = Console.ReadLine();
        bool flag = false;
        if(S[0] == S[1])
        {
            flag = true;
        }
        if(S[1] == S[2])
        {
            flag = true;
        }
        if(S[2] == S[3])
        {
            flag = true;
        }
        if(flag == true)
        {
            Console.WriteLine("Bad");
        }
        else
        {
            Console.WriteLine("Good");
        }
    }
    public static void Main()
    {
        var prog = new Prog();
        prog.run();
    }
}

//Array.ConvertAll(int.Parse)
//str.IndexOf("Stage",System.StringComparison.CurrentCulture)