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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
vector <int> x[50005];
int n,m,vizitat[50005];
void citire(){
fin>>n>>m;
int i,j,l;
for(l=1;l<=m;l++){
fin>>i>>j;
x[i].push_back(j);
}
}
void afisare(){
int i,j;
for(i=1;i<=m;i++){
for(j=0;j<x[i].size();j++)
cout << x[i][j] << " ";
cout << endl;
}
}
void dfs(int nod){
int i;
fout << nod << " ";
vizitat[nod]=1;
for(i=0;i<x[nod].size();i++)
if(!vizitat[x[nod][i]])
{
dfs(x[nod][i]);
}
}
void prelucrare(){
int i;
for(i=1;i<=n;i++)
if(!vizitat[i])
dfs(i);
}
int main(){
citire();
prelucrare();
return 0;
}