
import java.io.*;
import java.util.*;

class Main{
    public static void main(String[] args){
        solve();
    }

    public static void solve(){
        Scanner sc = new Scanner(System.in);
 		String s = sc.next();
 		boolean flag = true;
 		for(int i=0;i<s.length()-1;i++){
 			if(s.charAt(i)==s.charAt(i+1)){
 				flag = false;
 			}
 		}       
 		if(flag){
 			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