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[] $$) throws Exception {
		Scanner $ = new Scanner(System.in);
		String S = $.next();
		int Flag = 0;
		for (int i = 0; i < S.length() - 1; i++){
			if (S.substring(i, i + 1).equals(S.substring(i + 1, i + 2))){
				Flag += 1;
				break;
			}
		}
		if (Flag == 0) System.out.println("Good");
		else System.out.println("Bad");
		/*
		3776 -> Bad
		8080 -> Good
		1333 -> Bad
		0024 -> Bad
		*/
	}
}