#include <fstream>
#include <set>

using namespace std;
const int N = 1e4 * 5 + 1;

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

bool fq[N];
set <int> mat[N];
int n;

void dfs(int x)
{
    fq[x] = true;
    out << x << " ";
    for (auto k : mat[x])
        dfs(k);
}

int main()
{
    int n, m;
    in >> n >> m;
    for (int i = 0; i < m; i++)
    {
        int ns, nd;
        in >> ns >> nd;
        mat[ns].insert(nd);
    }
    dfs(1);
    return 0;
}