#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

#define NMAX 50001

ifstream f("sortaret.in");
ofstream g("sortaret.out");

bool viz[NMAX];
int v;
vector<int> graf[NMAX];

void DFS(int x)
{
    if (viz[x])
        return;
    viz[x] = 1;
    for (auto i : graf[x])
    {
        g << i << " ";
        DFS(i);
    }
}

int main()
{
    int m, x, y, i;
    f >> v >> m;
    for (i = 0; i < m; i++)
    {
        f >> x >> y;
        graf[x].push_back(y);
    }

    g << 1 << " ";
    DFS(1);

    return 0;
}