#include <bits/stdc++.h>
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
vector <int> v[100009];
int grad[100009], viz[100009];
signed main ()
{
    int n, m;
    f >> n >> m;
    vector <int> ans;
    for (int i=1; i<=m; i++)
    {
        int x, y;
        f >> x >> y;
        v[x].push_back(y);
        grad[y]++;
    }
    while (true)
    {
        if (ans.size()==n) break;
        cout << ans.size() << ' ';
        for (int i=1; i<=n; i++)
        {
            if (viz[i]) continue;
            if (grad[i]==0)
            {
                viz[i]=1;
                ans.push_back(i);
                for (int j=0; j<v[i].size(); j++)
                {
                    grad[v[i][j]]--;
                }
            }
        }
    }
    for (int i=0; i<ans.size(); i++)
    g << ans[i] << ' ';
}