#include <fstream>

using namespace std;

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

int n, m, t[2][200020], start[200020], ans[50010], nr;

void citire()
{
    int x;
    in>>n>>m;
    for(int i=1; i<=m; i++)
    {
        in>>x>>t[0][i];
        t[1][i]=start[x];
        start[x]=i;
    }
}

void dfs(int x)
{
    ans[++nr]=x;
    int man=start[x];
    while(man)
    {
        dfs(t[0][man]);
        man=t[1][man];
    }
}

void afisare()
{
    for(int i=1; i<=nr; i++)
        out<<ans[i]<<" ";
}

int main()
{
    citire();
    dfs(1);
    afisare();
    return 0;
}