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#include <bits/stdc++.h>
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
int sol[50001],k;
vector <int> G[50001];
int n,m;
void read()
{
int a,b;
f>>n>>m;
for(int i=1;i<=m;i++)
{
f>>a>>b;
G[a].push_back(b);
}
}
void DFS(int node)
{
sol[++k]=node;
for(auto x:G[node])
{
DFS(x);
}
}
int main()
{
read();
DFS(1);
for(int i=1;i<=k;i++)
g<<sol[i]<<" ";
}