import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String str[] =S.split(""); 
        int sum = 0;
        for(int i=0;i<3;i++)
        {
            if(str[i].equals(str[i+1]))
            {
                sum++;
            }
        }
        if(sum == 0)
        {
            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