#include <iostream>
#include <string>
#include <assert.h>
#include <inttypes.h>
#include <ctype.h>


static bool is_ip(std::string &s)
{
	size_t sl = s.size();
	assert (sl <= 20);
	size_t cnt = 0;
	for (size_t i = 0; i < sl; i++) {
		char c = s[i];
		if (c == '.') {
			cnt++;
			continue;
		}
		assert (isdigit(c));
		assert (uint32_t(c - '0') < 10);
	}
	assert (cnt == 3);
	s += '.';
	std::string t;
	for (size_t i = 0; i <= sl; i++) {
		char c = s[i];
		if (c != '.') {
			t += c;
			continue;
		}
		size_t tl = t.size();
		if (tl == 0)
			return false;
		unsigned int x = 0;
		for (size_t i = 0; i < tl; i++) {
			unsigned int v = t[i] - '0';
			x = x * 10 + v;
			if (x > 255)
				return false;
		}
		t.clear();
	}
	return true;
}


int main()
{
	std::string s;
	std::cin >> s;
	assert (std::cin);

	bool ok = is_ip(s);
	std::cout << (ok ? "Good" : "Bad") << std::endl;
	return 0;
}