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#include <fstream>
#include <vector>
#include <algorithm>
#include <set>
using namespace std;
ifstream fin ("ciclueuler.in");
ofstream fout("ciclueuler.out");
int n,m,x,y,viz[202];
bool ok,a[202][202];
vector <int> SOL,L[202];
void dfs(int nod)
{
for(int j=1;j<=n;j++)
if(a[nod][j])
{
a[nod][j]=0;
a[j][nod]=0;
dfs(j);
}
SOL.push_back(nod);
}
int main()
{
fin>>n;
while(fin>>x>>y)
{
a[x][y]=1;
a[y][x]=1;
}
dfs(1);
//fout<<SOL.size()<<"\n";
for(auto i:SOL)
fout<<i<<" ";
return 0;
}