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: Accepted)

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <iomanip>
#include <stack>
#include <queue>
typedef long long ll;

using namespace std;

int main() {
    string s;
    cin >> s;
    
    bool flag = false;
    for(int i = 0; i < s.size() - 1; i++) {
        if(s[i] == s[i + 1]) {
            flag = true;
        }
    }
    
    if(flag) {
        cout << "Bad" << endl;
    }
    else {
        cout << "Good" << endl;
    }
    
    return 0;
}