#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

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

    string s(n, '0');
    vector<int> cnt(m, 0);
    for(int i=0; i<n; ++i){
        for(int x : edges[i]){
            if(cnt[x] == 0)
                s[i] = '1';
        }

        if(s[i] == '1'){
            for(int x : edges[i])
                ++ cnt[x];
        }
    }

    for(int i=n-1; i>=0; --i){
        if(s[i] == '1'){
            s[i] = '0';
            for(int x : edges[i]){
                if(cnt[x] == 1)
                    s[i] = '1';
            }

            if(s[i] == '0'){
                for(int x : edges[i])
                    -- cnt[x];
            }
        }
    }

    reverse(s.begin(), s.end());
    s = s.substr(s.find('1'));
    cout << s << endl;

    return 0;
}