import java.util.*;
public class Main {
	public static void main(String[] args){
	  Scanner sc = new Scanner(System.in);
	  // 文字列の入力
	  String s = sc.next();
      
      char[] c = s.toCharArray();

      for(int i = 0; i < s.length()-1; i++) {
        if(c[i] == c[i+1]) {
          System.out.println("Bad");
          return;
        }
      }
      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