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

using namespace std;

ifstream in("sortaret.in");
ofstream out("sortaret.out");
vector < short > M[50050];
int Topo[50050], viz[50050];
short n, m, k;
void Citire()
{
    in >> n >> m;
    short x, y;
    for(short i = 1; i <= m; i++)
    {
        in >> x >> y;
        M[x].push_back(y);
    }
}

void DFS(int nod)
{
    viz[nod] = 1;
    for(short i = 0; i < M[nod].size(); i++)
        if(viz[M[nod][i]] == 0)
            DFS(M[nod][i]);
    Topo[++k] = nod;

}

int main()
{
    Citire();
    DFS(1);
    for(short i = k; i > 0; i--)
            out << Topo[i] << " ";
    return 0;
}