#include <fstream>
#include <vector>

using namespace std;

vector<int> L[50005];
vector<int> ans;
bool viz[50005];

void df(int v) {
    viz[v] = true;
    for(int i = 0; i < L[v].size(); i ++)
        if(!viz[L[v][i]]) df(L[v][i]);
    ans.push_back(v);
}

int main()
{
    ifstream f("sortaret.in");
    ofstream g("sortaret.out");
    int n, m, x, y;
    f >> n >> m;
    for(; m; m --) {
        f >> x >> y;
        L[x].push_back(y);
        L[y].push_back(x);
    }
    for(int i = 1; i <= n; i ++)
        if(!viz[i]) df(i);
    for(int i = ans.size() - 1; i >= 0; i --) g << ans[i] << " ";
    return 0;
}