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 C (GCC 5.4.1) (judge verdict: Accepted)

//#include "pch.h"
#include "stdio.h"
#include "stdlib.h"

int main()
{
	int n;
	scanf("%d", &n);

	int nPrev;
	int nNext;

	nNext = n % 10;
	n /= 10;

	int flag = 0;
	for (int i = 3; i > 0; i--)
	{
		nPrev = nNext;
		nNext = n % 10;
		n /= 10;
		if (nNext == nPrev)
		{
			flag = 1;
			break;
		}
	}

	if (flag)
		printf("Bad");
	else
		printf("Good");

	return 0;
}