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#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
int n, m, topo[50000], K;
bool bulean[50000];
vector<int> a[100000], elem;
void Solve(int nod)
{
if(!bulean[nod])
{
topo[K++]=nod;
bulean[nod]=true;
for(int i=0;i<a[nod].size();++i)
Solve(a[nod][i]);
}
}
bool cmp(int i, int j)
{
for(int k=1;k<a[i].size();k++)
if(a[i][k]==j) return true;
return false;
}
int main()
{
f>>n>>m;
for(int i=1;i<=m;++i)
{
int aux, aux2;
f>>aux>>aux2;
a[aux].push_back(aux2);
elem.push_back(i);
}
/*for(int i=1;i<=n;++i)
Solve(i);*/
/* for(int i=0;i<n;++i)
g<<elem[i]<<' ';
g<<'\n';*/
sort(elem.begin(), elem.end(), cmp);
for(int i=0;i<n;++i)
g<<elem[i]<<' ';
return 0;
}