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 Java7 (OpenJDK 1.7.0) (judge verdict: Accepted)

import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System. in);
      
      	boolean isBad = false;
      	String str = sc.next();
      	//String [] strArr = str.split("");
      	String a = "";
      
      	for (int i = 0; i <= 3; i++){
          //	System.out.println(strArr[i]);
           if (String.valueOf(str.charAt(i)).equals(a)){
            isBad = true; 
           }
          a = String.valueOf(str.charAt(i));
        }
      	String out = "";
      	if (isBad == true){
          out = "Bad";
        }else{
          out = "Good";
        }
		System.out.println(out);
	}
}