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#include <fstream>
#include <vector>
#include <stack>
using namespace std;
ifstream fin("ciclueuler.in");
ofstream fout("ciclueuler.out");
vector<int> v[100001];
vector<int>::iterator it;
int n,m,i,aux,nod,x,y;
stack<int> s;
void sterge_muchia(int x, int y)
{
for (vector<int>::iterator it = v[x].begin(); it != v[x].end(); it ++)
if (*it == y)
{
v[x].erase(it);
break;
}
}
int main()
{
fin>>n>>m;
for (i=1;i<=m;i++)
{
fin>>x>>y;
v[x].push_back(y);
v[y].push_back(x);
}
for (i=1;i<=n;i++)
if (v[i].size() % 2 != 0 || v[i].empty())
{
fout<<-1;
return 0;
}
nod = 1;
s.push(nod);
while (!s.empty())
{
if (!v[nod].empty())
{
aux = v[nod].back();
v[nod].pop_back();
sterge_muchia(aux, nod);
s.push(aux);
nod = aux;
}
else
{
aux = s.top();
s.pop();
if (!s.empty())
fout<<aux<<" ";
}
}
return 0;
}