#include <fstream>
#include <vector>
#include <algorithm>

using namespace std;

ifstream cin ("sortaret.in");
ofstream cout ("sortaret.out");

const int N = 5e4;

bool viz[N + 1];

vector <int> sol, g[N + 1];

int n, m, x, y;

void dfs (int node)
{
    viz[node] = 1;
    for (auto it : g[node])
        if (!viz[it])
        dfs (it);
    sol.push_back(node);
}

int main()
{
    cin >> n >> m;
    for (int i = 1; i <= m; ++i)
    {
        cin >> x >> y;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    for (int i = 1; i <= n; ++i)
        if (!viz[i])
        dfs (i);
    reverse (sol.begin(), sol.end());
    for (auto it : sol)
        cout << it << ' ';
    return 0;
}