#include <bits/stdc++.h>

using namespace std;

vector <int> adj[100001];
bool check[100001];
int n, m, a, b;

int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    memset(check, false, sizeof(check));

    cin >> n >> m;

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

    for (int i = 0; i < n; i++)
    {
        sort(adj[i].rbegin(), adj[i].rend());
    }

    for (int i = n - 2; i >= 0; i--)
    {
        bool flag = false;
        for (auto it : adj[i])
        {
            if (it < i)
            {
                break;
            }
            if (!check[it])
            {
                flag = true;
                break;
            }
        }
        check[i] = flag;
    }

    int idx = 0;
    for (int i = n - 1; i >= 0; i--)
    {
        if (check[i])
        {
            idx = i;
            break;
        }
    }

    for (int i = idx; i >= 0; i--)
    {
        cout << check[i];
    }
    cout << '\n';

    return 0;
}