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

int main() {
    int n, m;
    cin >> n >> m;
    vector<vector<int>> adj(n);
    for (size_t i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    bool select[n] = {};
    bool selected = false;
    for (int i = n - 1; i >= 0; i--) {
        if (select[i]) {
            selected = true;
        } else {
            for (auto to : adj[i]) {
                select[to] = true;
            }
        }
        if (selected) {
            cout << select[i];
        }
    }
    cout << endl;
}