#include <iostream>
#include <fstream>

using namespace std;

int n, m;
int a[10][10];
int viz[10];

void DFS(int v)
{
    cout << v << ' ';
    viz[v] = 1;

    for (int i = 1; i <= n; i++)
        if (a[v][i] == 1 && viz[i] == 0)
            DFS(i);
}

void citire()
{
    ifstream f("graf.in");
    int x, y;
    f >> n >> m;

    for (int i = 1; i <= m; i++)
    {
        f >> x >> y;
        a[x][y] = a[y][x] = 1;
    }
}

void afisare()
{
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= n; j++)
            cout << a[i][j] << ' ';

        cout << endl;
    }
}

int grad(int v)
{
    int s = 0;

    for (int i = 1; i <= n; i++)
        s += a[v][i];

    return s;
}

void Frunze()
{
    for (int i = 1; i <= n; i++)
        if (grad(i) == 1)
            cout << i << ' ';
}

int main()
{
    citire();
    //afisare();

    for (int i = 1; i <= n; i++)
        if (viz[i] == 0)
    {
        DFS(i);
        cout << endl;
    }
    Frunze();
    return 0;
}