#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
bool bo[100010] = { false };
vector<vector<int>> vec(100010);
int main() {
	int n, m;
	cin >> n >> m;
	for (int i = 0; i < m; i++) {
		int a, b;
		cin >> a >> b;
		vec[a].emplace_back(b);
		vec[b].emplace_back(a);
	}
	for (int i = n - 1; i >= 0; i--) {
		if (!bo[i]) {
			for (int j = 0; j < vec[i].size(); j++) {
				bo[vec[i][j]] = true;
			}
		}
	}
	bool bo1 = false;
	for (int i = n - 1; i >= 0; i--) {
		if (bo[i]) {
			bo1 = true;
		}
		if (bo1) {
			cout << bo[i];
		}
	}
	cout << endl;
}