import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

class Main{
  public static void main(String args[]) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String s = br.readLine();
    String res = "Good";
    
	if(s.charAt(0) == s.charAt(1)){
      res = "Bad";
    }
	if(s.charAt(1) == s.charAt(2)){
      res = "Bad";
    }
	if(s.charAt(2) == s.charAt(3)){
      res = "Bad";
    }
    System.out.print(res);
  }
}
/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