import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	String s = sc.next();
      	boolean isGood = true;
      	if(s.charAt(0) == s.charAt(1)) isGood = false;
      	if(s.charAt(1) == s.charAt(2)) isGood = false;
      	if(s.charAt(2) == s.charAt(3)) isGood = false;
      	
      	if(isGood) System.out.println("Good");
      	else System.out.println("Bad");
    }
}
/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