#include <fstream>
#include <vector>
#define w 50001
using namespace std;
vector <unsigned int> a[w];
vector <unsigned int> st;
bool viz[w];
void dfs(unsigned int x)
{
    viz[x]=1;
    unsigned int j,y;
    st.push_back(x);
    for (j=0;j<a[x].size();j++)
    {
        y=a[x][j];
        if (!viz[y])
        {
            dfs(y);
        }
    }
}
int main()
{
    ifstream f("sortaret.in");
    ofstream g("sortaret.out");
    unsigned int i,n,m,x,y,j;
    f>>n>>m;
    for (i=1;i<=m;i++)
    {
        f>>x>>y;
        a[x].push_back(y);
    }
    for (i=1;i<=n;i++)
    {
        if (!viz[i])
        {
            dfs(i);
            for (j=0;j<st.size();j++)
                g<<st[j]<<' ';
            st.clear();
        }
    }
    g<<'\n';
    f.close();
    g.close();
    return 0;
}