import java.util.*;

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    boolean good = true;
    
    for (int i=0;i<S.length()-1;i++){
     if (S.charAt(i) == S.charAt(i+1)){
       good = false;
     }
    }
    if (good){
      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