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 <string>
#include <algorithm>
#include <vector>
#include <math.h>
using namespace std;
using std::swap;

// priceをキーに降順でソート
//sort(fruits.begin(), fruits.end(),
//     [](const fruit& x, const fruit& y) { return x.price > y.price;});

int main() {
    string S;
    std::cin >> S;
    int flg=0;
    for(int i=0; i<3; i++) {
        if (S[i]==S[i+1]){
            flg=1;
        }
    }
    if(flg==0){
        std::cout << "Good" << std::endl;
    }
    else{
        std::cout << "Bad" << std::endl;
    }

    return 0;
}