#include <cstdio>
#include <cstring>
#include <iostream>
#include <math.h>
#include <stdio.h>
#include <algorithm>
#include <stdlib.h>
#include <map>
#include <vector>
#include <set>
#include <stack>
#include <queue>
using namespace std;
const int maxn = 10010;
int indegree[maxn]={0};
vector<int> g[maxn],print;
int n,m;
bool tologicalSort(){
	int count=0;
	queue<int> q;
	for(int i=0;i<n;i++){
		if(indegree[i]==0){
			q.push(i);
		}
	}
	while(!q.empty()){
		int u = q.front();
		q.pop();
		for(int i=0;i<g[u].size();i++){
			int v=g[u][i];
			indegree[v]--;
			if(indegree[v]==0){
				q.push(v);
			}
		}
		print.push_back(u);
		count++;
		
	}
	if(count==n) return true;
	else return false;
}
int main()
{
	scanf("%d%d",&n,&m);
	print.clear();
	for(int i=0;i<m;i++){
		int a,b;
		scanf("%d%d",&a,&b);
		g[a].push_back(b);
		indegree[b]++;
	}
	bool istol = tologicalSort();
	for(int i=0;i<print.size();i++){
		printf("%d ",print[i]);
	}
	return 0;
}