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.Scanner;

public class Main {
	public static void main(String[] args) {
                solve();
	}

    private static void solve() {
    	Scanner sc = new Scanner(System.in);
    	char[] sCode = sc.next().toCharArray();

    	boolean isExistSameCode = false;
    	for(int i = 0; i < 3; i++)
    	{
    		if(sCode[i] == sCode[i+1]) {
    			isExistSameCode = true;
    			break;
    		}
    	}

    	if(isExistSameCode)
    	{
    		System.out.print("Bad");
    	}
    	else System.out.print("Good");
	}
}