import java.util.*;

class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		int flag = 0;
		for(int i = 0; i < s.length()-1; i++){
			if(s.substring(i,i+1).equals(s.substring(i+1,i+2))){
				flag = 1;
			}
		}
		System.out.print(flag == 1?"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