import java.util.Scanner;
public class Main{
  public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
   String x = sc.next();
   String s = "0";
   for( int i = 0; i <= 2 ; i++){
     String y = x.substring(i, i+1);
	  if( y.equals(x.substring(i + 1, i + 2))){
        System.out.println("Bad");
        s = "1";
        break;
      }
    }
    if( s.equals("0")){
      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