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 atcoder
{
    class Program
    {
        static void Main(string[] args)
        {
            // 整数の入力
            int a = int.Parse(Console.ReadLine());
            String str = "Good";

            int[] b =new int[4];
            b[0] = a / 1000;
            a -= b[0] * 1000;
            b[1] = a / 100;
            a -= b[1] * 100;
            b[2] = a / 10;
            a -= b[2] * 10;
            b[3] = a;

            for (int i = 0; i < 2; i++)
            {
                if (b[i] == b[i + 1])
                {
                    str = "Bad";
                    break;
                }
            }

            Console.WriteLine(str);
        }
    }
}