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 9.2.1) (judge verdict: Runtime Error)

#include<stdio.h>
int main() {
  	int n=0;
  	char c[4];
  	for(int i=0; i<4; i++) {
    	scanf("%c",c[i]);
    }
  	for(int i=0; i<3; i++) {
    	if(c[i] == c[i+1]) {
          n++;
        }  
    }
  	if(n=0) 
    	printf("Good");
  	else
      	printf("Bad");
  return 0;
}