import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String ss[] = new String[4];
    for(int i = 0;i<4;i++){
      ss[i] = s.substring(i,i+1);
    }
    for(int i = 0;i<3;i++){
      if(ss[i].equals(ss[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