#include<fstream>
#include<vector>
#define NMAX 50005
using namespace std;
ifstream f ("sortaret.in");
ofstream g ("sortaret.out");
vector <int> A[NMAX];
int viz[NMAX], prim[NMAX];
int main()
{
    int N, M, i, j, x, y;
    f>>N>>M;
    for(i=1;i<=M;i++) f>>x>>y, A[x].push_back(y), prim[y]=1;
    for(i=1;i<=N;i++) if(!prim[i]) g<<i<<" ", viz[i]=1;
    for(i=1;i<=N;i++)
      for(j=0;j<A[i].size();j++) 
        if(!viz[A[i][j]]) g<<A[i][j]<<" ", viz[j]=1;
    f.close();
    g.close();
    return 0;
}