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 <stdio.h>

#define TRUE 1
#define FALSE 0
#define MAX_LEN 5

int main(void)
{
	char S[MAX_LEN];
	int i, ok = TRUE;
	scanf("%s", S);

	for (i = 1; i < MAX_LEN; i++)
		if (S[i] == S[i - 1])
			ok = FALSE;
	puts(ok ? "Good" : "Bad");
	return 0;
}