
import java.util.*;

class Main{
    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        int n = stdIn.nextInt();
        int[] a = new int[4];
        for(int i = 0 ; i < 4; i++){
            a[i] = n % 10;
            n /= 10;
        }
        System.out.println((a[0] == a[1] || a[1] == a[2] || a[2] == a[3]) ? "Bad" : "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