#include <bits/stdc++.h>

using namespace std;

ifstream fin("sortaret.in");
ofstream fout("sortaret.out");

int n, m, x, y;
vector<int> v[50010];
bitset<500010> viz;

void dfs(int node)
{
    fout << node << " ";
    viz[node] = 1;
    for (auto it : v[node])
        if (!viz[it])
            dfs(it);
}

int main()
{
    fin >> n >> m;
    for (int i = 1; i <= m; i++)
    {
        fin >> x >> y;
        v[x].push_back(y);
    }
    dfs(1);
    return 0;
}