#include <iostream>
#include <fstream>
#include <bits/stdc++.h>
#include <map>
using namespace std;
map <int, int> p;
int main()
{

    ifstream fin("sortaret.in");
    ofstream fout("sortaret.out");
    int N,M,i,j;
    fin>>N>>M;
    for(i=1;i<=M;i++)
    {
        fin>>x>>y;
        p[x]=1;
        p[y]=1;
    }
    for(auto it:p[])
    fin.close();
    fout.close();
    return 0;
}