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.*;
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String str = sc.next(); //例：Main
    String array[] = new String[str.length()];
    String before = str.substring(0, 1);
    String here = "";
    boolean isGood = true;
    for (int i = 1; i < array.length; i++) {
      here = str.substring(i, i + 1);
      if(here.equals(before)){
        isGood = false;
        break;
      }
      before = str.substring(i, i + 1);
    }
    if(isGood){
      System.out.println("Good");   
    }else{
      System.out.println("Bad");   
    }
  }
}