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#include <fstream>
#include <vector>
#define nmax 100005
#define mmax 500005
using namespace std;
fstream f1("ciclueuler.in", ios::in);
fstream f2("ciclueuler.out", ios::out);
vector <pair<int, int> > v[nmax];
int n, m, nre, eu[mmax], ok=1, gr[nmax], viz[mmax];
void citire()
{
int i, x, y;
f1>>n>>m;
for(i=1; i<=m; i++)
{
f1>>x>>y;
v[x].push_back({y, i});
v[y].push_back({x, i});
if(x!=y) {gr[x]++; gr[y]++;}
}
for(i=1; i<=n; i++)
if(gr[i]%2==1)
{
ok=0; break;
}
}
void dfs(int nod)
{
while(v[nod].size()>0)
{
int vec=v[nod].back().first, ind=v[nod].back().second;
v[nod].pop_back();
if(!viz[ind])
{
viz[ind]=1;
dfs(vec);
}
}
nre++; eu[nre]=nod;
}
void afis()
{
int i;
for(i=1; i<nre; i++)
f2<<eu[i]<<' ';
}
int main()
{
citire();
if(ok)
{
dfs(1);
afis();
}
else f2<<-1;
return 0;
}