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#include <bits/stdc++.h>
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
vector <int> v[50100];
int t,viz[50100],sol[50100];
void DFS(int nod)
{
viz[nod]=1;
for(int i=0;i<v[nod].size();i++)
{
int vecin=v[nod][i];
if(viz[vecin]==0)viz[vecin]=1,DFS(vecin);
}
t++;sol[t]=nod;
}
int n,i,m,x,y;
int main()
{
f>>n>>m;
for(i=1;i<=m;i++)
{
f>>x>>y;
v[x].push_back(y);
}
DFS(1);
for(i=t;i>=1;i--)g<<sol[i]<<" ";
return 0;
}