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 <numeric>
//#include <stdio.h>
//#include <stack>
//#include <queue>
#include <cstdio>
#include <cmath>
#include <iterator>
#include <map>
//#include <fstream>
//#include <list>
//#include <iomanip>
#include <stdlib.h>
#include <cctype>

using namespace std;

#define MOD 1000000007
#define Int int64_t
#define PI 3.14159265358979
#define ssort(z) sort(z.begin(),z.end())
#define rsort(z) sort(z.rbegin(),z.rend())
#define eerase(z) z.erase(unique(z.begin(),z.end()),z.end())
#define ccnt(z,w) count(z.begin(),z.end(),w)


void printVec(std::vector<int> & vec) {
	std::cout << "";
	for (auto it = vec.begin(); it != vec.end(); ++it) {
		std::cout << *it << " ";
	}
	std::cout << std::endl;
}
void printVec1(std::vector<string>& vec) {
	std::cout << "";
	for (auto it = vec.begin(); it != vec.end(); ++it) {
		std::cout << *it << " ";
	}
	std::cout << std::endl;
}
void printVec2(std::vector<Int>& vec) {
	std::cout << "";
	for (auto it = vec.begin(); it != vec.end(); ++it) {
		std::cout << *it << " ";
	}
	std::cout << std::endl;
}

Int gcd(Int a, Int b) {
	return b != 0 ? gcd(b, a % b) : a;
}
Int lcm(Int a, Int b) {
	return a / gcd(a, b) *b;
	//a*bは64bit integer overflow
}

bool comp(const string a, const string b) {
	return a.length() < b.length();
}

bool integer(double num) {
	return floor(num) == num;
}

string gen(int num) {
	string str = "";
	for (int i = 0; i < num; i++) str += ".";
	return str;
}
Int fact(int num) {
	if (num == 0) return 1;
	else return num * fact(num - 1);
}


int main() {
	string n; cin >> n;
	char t = n[0];
	for (int i = 1; i < 4; i++) {
		if (n[i] == t) {
			cout << "Bad";
			return 0;
		}
		t = n[i];
	}
	cout << "Good";

	cout << endl;
	return 0;
}