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: Wrong Answer)

#include<stdio.h>
#include<string.h>
int main()
{
	char S;
	int x1,x2,x3,x4;
	scanf("%c",&S);
	x1 = S/1000;
	x2 = (S/100)-(x1*10);
        x3 = (S/10)-(x2*10)-(x1*100);
	x4 = S-(x3*10)-(x2*100)-(x1*1000);
        if(x1==x2 || x2==x3 || x3==x4)
		printf("Bad\n");
        else
		printf("Good\n");
	return 0;
}