#include <iostream>
#include <cstdio>
#include <vector>
using namespace std;
FILE* f=fopen("ciclueuler.in","r");
FILE* g=fopen("ciclueuler.out", "w");
int n,m,x,y,ok=1;
vector <int> v[100001];
int conex()
{

}
int main()
{
    fscanf(f,"%d%d",&n,&m);
    for(int i=0;i<m;i++)
    {
        fscanf(f,"%d%d",&x,&y);
        v[x].push_back(y);
        v[y].push_back(x);
    }
    for(int i=0;i<n;i++)
        if(v[i].size()%2)
            ok=0;
    if(ok and conex())
    {

    }
    return 0;
}