import java.util.*;

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

        for(int i=1; i<4; i++) {
            if(s.charAt(i-1) == s.charAt(i)) {
                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