import java.util.*;

public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    String  S = sc.next();
   // char[] s = S.toCharArray();
    //ArrayList<Character> aa = new ArrayList<>();

	if(S.charAt(0)==S.charAt(1)){
		System.out.println("Bad");
    }else if(S.charAt(1)==S.charAt(2)){
		System.out.println("Bad");
    }else if(S.charAt(2)==S.charAt(3)){
		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