#include<fstream>
#define Nmax 2000
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
int n,m;
int A[Nmax][Nmax],nrp[Nmax];
void citire();
int main()
{
    citire();
    int i,j,nr_nodprez=0,nr_nivel=0;
    while(nr_nodprez<n)
    {
        for(i=1;i<=n;i++)
        if(nrp[i]==0)
        {
            fout<<i<<" ";
            nr_nodprez++;
            nrp[i]=-1;
            for(j=1;j<=A[i][0];j++)
                nrp[A[i][j]]--;

        }
        fout<<'\n';
    }
    return 0;
}
void citire()
{
    int i,x,y;
    fin>>n>>m;
    for(i=1;i<=m;i++)
    {   fin>>x>>y;
        A[x][0]++;
        A[x][A[x][0]]=y;
        nrp[y]++;
    }
}