#include<fstream>
#include<vector>

using namespace std;

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

int n,m,i,x,y,ok[50001];
vector<int> a[50001];

void DF(int nod)
{
    out<<nod<<' ';
    ok[nod]=1;
    for (vector<int>::iterator it=a[nod].begin();it!=a[nod].end();it++)
        if (!ok[*it]) DF(*it);
}

int main()
{
    in>>n>>m;
    for (i=1;i<=m;i++)
    {
        in>>x>>y;
        a[x].push_back(y);
    }
    DF(1);
}