#include <iostream>
#include <algorithm>
#include <vector>
#include <deque>
#include <string>
#include <tuple>
#include <functional>
#include <numeric>
#include <cmath>
#include <iomanip>
#include <map>
#include <random>
//#include "toollib.h"
#define INT_MAX 2147483647
#define Loop(i, n) for(int i = 0; i < (int)n; i++)
#pragma warning (disable:4018)

using namespace std;

int main() {
	string s="000";
	string judge;
	while (true) {
		cout << s << endl;
		if (s[2] != '9') s[2]++;
		else if (s[1] != '9') {
			s[1]++;
			s[2] = '0';
		}
		else {
			s[0]++;
			s[1] = '0';
			s[2] = '0';
		}
	}
	return 0;
}