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#include<iostream>
#include <fstream>
#include <list>
using namespace std;
list<int> V[100000];
bool grad[100000];
int n, m, x, y;
void read(){
ifstream f("ciclueuler.in");
f>>n>>m;
for(int i=0; i<m; i++)
f>>x>>y,
V[y].push_back(x),
V[x].push_back(y),
grad[y]=!grad[y],
grad[x]=!grad[x];
}
int main(){
for(int i=0;1<n;i++)
if(!grad[i])
{
ofstream g("ciclueuler.in"); g<<-1;
}
return 0;
}