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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)



import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		String[] lines = line.split("");
		boolean flag = true;
		int before = Integer.parseInt(lines[0]);

		for(int i = 1 ; i < lines.length ; i++) {
			int after = Integer.parseInt(lines[i]);
			if(before == after) {
				flag = false;
				break;
			}
			before = after;
		}

		if(flag) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		}

	}

}