import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int a1 = a/1000;
		int a2 = a/100 - a1 * 10;
		int a3 = a/10 -a2 * 10 -a1*100;
	    int a4 = a - a3 * 10 -a2*100 -a1*1000;
	    if(a1 == a2 || a2 == a3 || a3 == a4 ){
	        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