import java.util.*;
public class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    String a = sc.next();
    String[] s = a.split("");
    int[] ary = new int[4];
    for(int count = 0;count<4;count++){
      ary[count] = Integer.parseInt(s[count]);
      if(count>0&&ary[count]==ary[count-1]){
        System.out.println("Bad");
        break;
      }else if(count==3){
          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