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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <cstdlib>
#include<iostream>
using namespace std;


int main(void) {


    char s[4];
    cin.getline(s,4);
    int i;
    char a;
    int b=0;
    for(i=0;i<4;i++)
    {
        if(i==0) a=s[i];
        else if(i!=0&&s[i]==s[i-1])b++;
    }
    if(b==0)cout<<"Good"<<endl;
    else cout<<"Bad"<<endl;
    
    return 0;
}