#include<iostream>
#include <list>
#include <stack>
#include <fstream>
using namespace std;

ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
class Graph
{
    int V;
    list<int> *adj;
    void topologicalSortUtil(int v, bool visited[], stack<int> &Stack);
public:
    Graph(int V);
    void addEdge(int v, int w);
    void topologicalSort();
};

Graph::Graph(int V){
    this->V = V;
    adj = new list<int>[V];
}

void Graph::addEdge(int v, int w){
    adj[v].push_back(w);
}
void Graph::topologicalSortUtil(int v, bool visited[],
                                stack<int> &Stack){
    visited[v] = true;
    list<int>::iterator i;
    for (i = adj[v].begin(); i != adj[v].end(); ++i)
        if (!visited[*i])
            topologicalSortUtil(*i, visited, Stack);
    Stack.push(v);
}
void Graph::topologicalSort()
{
    stack<int> Stack;
    bool *visited = new bool[V];
    for (int i = 0; i < V; i++)
        visited[i] = false;
    for (int i = 0; i < V; i++)
      if (visited[i] == false)
        topologicalSortUtil(i, visited, Stack);
    while (Stack.empty() == false)
    {
        fout << Stack.top() << " ";
        Stack.pop();
    }
}
int main()
{
    int n,m;
    fin>>n>>m;
    Graph g(n);
    for(int i=1;i<=m;++i){
        int x,y;
        fin>>x>>y;
        g.addEdge(x,y);
    }
    g.topologicalSort();
    return 0;
}