#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

int m,n,contor,viz[100001],x,y;
vector<int> a[100001];

void dfs(int nod)
{
    viz[nod]=1;
    for(int i=0;i<a[nod].size();i++)
    {
        if(viz[a[nod][i]]==0)
            {
       // viz[a[nod][i]] = 1;
        dfs(a[nod][i]);
            }
    }
}

int main()
{
    ifstream in("dfs.in");
    ofstream out("dfs.out");
    in >> n >> m;
    for(int i=0;i<m;i++)
    {
        in >> x >> y;
        a[x].push_back(y);
        a[y].push_back(x);
    }

    for(int i=1;i<=n;i++)
        if(!viz[i])
    {
        cout << i << " ";
        contor++;
        dfs(i);
    }
    out << contor;
    return 0;
}