#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
const int Nmax=50000+5;
vector <int >v[Nmax];
vector <int> p;
bool viz[Nmax];
int DP[Nmax];
int Nr[Nmax];
int n,m;
void DFS(int nod)
{
    p.push_back(nod);
    viz[nod]=1;
    for(int i=0;i<v[nod].size();++i)
        if(viz[v[nod][i]]==0 && (DP[v[nod][i]]>DP[nod]+1 or DP[v[nod][i]]==0))
        {
            DP[v[nod][i]]=DP[nod]+1;
            DFS(v[nod][i]);
        }
}
int main()
{
    fin>>n>>m;
    for(int i=1,x,y;i<=m;++i)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    //for(int i=1;i<=n;++i,cout<<'\n')
        //for(int j=0;j<v[i].size();++j)
            //cout<<v[i][j]<<" ";
    for(int i=1;i<=n;++i)
        if(!v[i].empty())
        {
            DP[i]=0;
            DFS(i);
            break;
        }
    //for(int i=1;i<=n;++i)
        //cout<<DP[i]<<" ";
    for(int i=0;i<p.size();++i)
        fout<<p[i]<<" ";
    return 0;
}