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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
vector <int> v[50005];
int k,n,m,a[50005],viz[50005];
void sortt(int c)
{
viz[c]=1;
for(int i=0;i<v[c].size();i++)
if(viz[v[c][i]]==0)
sortt(v[c][i]);
a[k++]=c;
}
int main()
{
int x,y;
f>>n>>m;
for(int i=0;i<m;i++)
{
f>>x>>y;
v[x].push_back(y);
}
for(int i=0;i<n;i++)
{
if(viz[i]==0)
sortt(i);
}
for(int i=n;i>0;i--)
g<<a[i]<<" ";
return 0;
}