import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
	Scanner str = new Scanner(System.in);

	String S = str.nextLine();
	String[] x = S.split("");
	int n = 0;

	for (int i = 0; i < x.length - 1; i++) {
	    if (x[i].compareTo(x[i + 1]) == 0) {
		n++;
	    }
	}

	if (n > 0) {
	    System.out.println("Bad");
	} else {
	    System.out.println("Good");
	}
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz