#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

ifstream citire("sortaret.in");
ofstream afisare("sortaret.out");

vector<int>nod;
vector<vector<int>>g(50001);//matricea de adiacenta
vector<bool>viz(50001);//vector noduri vizitate

void dfs(int n)
{
    viz[n] = true;
    for(int i=0; i<g[n].size(); i++)
        if(viz[g[n][i]]==false)
            dfs(g[n][i]);
    nod.push_back(n);
}

int main()
{
    int vf,arc,a,b,i;
    citire>>vf>>arc;

    for( i=0; i<arc; i++)
    {
        citire>>a>>b;
        g[a].push_back(b);
    }

    for( i=0;i<vf; i++)

        if(viz[i]==false)
            dfs(i);

    for( i=nod.size()-1; i>=0; i--)
        afisare<<nod[i]<<" ";
}