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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("ciclueuler.in");
ofstream g("ciclueuler.out");
int a[10000][1000],n,m,t[100],i,x,y;
void euler(int v)
{
int w;
for(w=1;w<=n;w++)
{
if(a[v][w])
{
a[v][w]--;a[w][v]--;
euler(w);
}
}
g<<v<<" ";
}
int main()
{
f>>n>>m;
for(i=1;i<=m;i++)
{
f>>x>>y;
a[x][y]++;a[y][x]++;
}
euler(1);
return 0;
}