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 <iomanip>
#include <vector>
#include <string>
#include <math.h>
#include <algorithm>
#include <tuple>
#include <utility>
#include <stdlib.h>
#include <set>
#include <map>
using namespace std;
#define rep(i,n,x) for(int i=n;i<x;i++)
#define SORT(x) sort(x.begin(),x.end())
#define RSORT(x) sort(x.begin(),x.end(),greater<int>())
#define all(x) x.begin(), x.end()
#define pb push_back
#define mp make_pair
#define setp(x) setprecision(x)
using LL = long long;
using ULL = unsigned long long;

int main() {
	string s, ans = "Good";
	cin >> s;
	rep(i, 0, 3) {
		if (s[i] == s[i + 1]) {
			ans = "Bad";
		}
	}
	cout << ans << endl;

	return 0;
}