Problem:
Score : 100 points

Problem Statement

The door of Snuke's laboratory is locked with a security code.

The security code is a 4-digit number. We say the security code is hard to enter when it contains two consecutive digits that are the same.

You are given the current security code S. If S is hard to enter, print Bad; otherwise, print Good.

Constraints

S is a 4-character string consisting of digits.

Input

Input is given from Standard Input in the following format:

S

Output

If S is hard to enter, print Bad; otherwise, print Good.

Sample Input 1

3776

Sample Output 1

Bad

The second and third digits are the same, so 3776 is hard to enter.

Sample Input 2

8080

Sample Output 2

Good

There are no two consecutive digits that are the same, so 8080 is not hard to enter.

Sample Input 3

1333

Sample Output 3

Bad

Sample Input 4

0024

Sample Output 4

Bad

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

    import java.util.Scanner;
     
    public class Main{
      public static void main(String[] args){
    	Scanner in=new Scanner(System.in);
    	int N=in.nextInt();
        int L=in.nextInt();
        int flavour=0;
        for(int i=1;i<=N;i++)
          flavour+=L+i-1;
//        System.out.println(flavour);
       	int min=Integer.MIN_VALUE;
        for(int i=1;i<=N;i++){
        	if(flavour-(L+i-1)>min){
              min=flavour-(L+i-1);
            }
        }
        System.out.println(min);
        in.close();
      }
    }