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#include <bits/stdc++.h>
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
vector<int>v[50005];
int n,m,x,y,viz[50005];
void dfs(int nod){
viz[nod]=1;
fout<<nod<<' ';
for(int i:v[nod]){
if(viz[i]==0)
dfs(i);
}
//fout<<nod<<' ';
}
int main()
{
fin>>n>>m;
for(int i=1;i<=m;i++){
fin>>x>>y;
v[x].push_back(y);
//v[x].push_back(y);
}
dfs(1);
return 0;
}