import java.util.*;
import static java.lang.System.*;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] S =sc.next().toCharArray();
		char c = S[0];
		boolean flag = true;
		for(int i =1; i < S.length; i++) {
			if (S[i] == c) {
				flag = false;
				break;
			}
			c = S[i];
		}
		if(flag) out.println("Good");
		else 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