import java.util.Scanner;
 
public class Main {
  public static void main ( String[] args ) {
 
    Scanner sc = new Scanner ( System.in );

    String S = sc.next();

    char[] s = S.toCharArray();
    
    boolean flag = false;
    
    for(int i = 0 ; i < 3 ; i++){
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    }
    
    if(flag){
      System.out.println("Bad");
    }else{
      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