#include <bits/stdc++.h>
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");

int n, m, viz[50001], a[50001], k;
vector <int> G[50001];

void DFS(int nod)
{
    viz[nod] = 1;
    for (auto next : G[nod])
        if (!viz[next])
            DFS(next);
    a[++k] = nod;
}

int main()
{
    int i, x, y;
    fin >> n >> m;
    for (i = 1 ; i <= m ; i++)
    {
        fin >> x >> y;
        G[x].push_back(y);
    }
    DFS(1);
    for (i = k ; i >= 1 ; i--)
        fout << a[i] << " ";
    return 0;
}