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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
import java.io.*;

public class Main {
    public static void main(String... args) {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String password = null;
        try {

            password = br.readLine();
            br.close();
        } catch(IOException e) {
            e.printStackTrace();
        }

        System.out.println(isDifficultToInput(password) ? "Bad" : "Good");
    }

    private static boolean isDifficultToInput(String word){
        String[] splitWord = word.split("");

        for(int i = 0; i < splitWord.length - 1; i++){
            String rear = splitWord[i];
            String front = splitWord[i+1];
            if(front.equals(rear)){
                return true;
            }
        }
        return false;
    }
}