import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String N = sc.next();
        String[] array = N.split("");
        boolean ans = false;
        
        for(int i = 0 ; i < 3;i++) {
        	if(array[i].equals(array[i+1])) {
        		ans = true;
        		break;
        	}
        }
       System.out.println(ans?"Bad":"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