#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int check[100000];
int del[100000];
vector<int> G[100000];

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n, m;
	cin >> n >> m;
	for(int i = 0; i < m; i++) {
		int a, b;
		cin >> a >> b;
		G[a].push_back(i);
		G[b].push_back(i);
	}

	for(int i = n - 1; i >= 0; i--) {
		bool ok = true;
		for(auto id : G[i]) {
			if(check[id]) {
				ok = false;
				break;
			}
		}
		if(ok) {
			for(auto id : G[i]) {
				check[id] = 1;
			}
			del[i] = 1;
		}
	}

	string s;
	for(int i = 0; i < n; i++) {
		if(del[i]) s += '0';
		else s += '1';
	}
	while(s.back() == '0') s.pop_back();
	reverse(s.begin(), s.end());

	if(s == "") s = "0";
	cout << s << endl;
}