#include <iostream>
#include <fstream>
using namespace std;
ifstream f("sortaret.in");
struct nod
{
    int inf;
    nod *urm;
}*l[101];
int viz[101],v[101],k,n,m;
void adaug(nod *&p,int x)
{
    nod *c;
    c=new nod;
    c->inf=x;
    c->urm=p;
    p=c;
}
void citire()
{
    f>>n>>m;
    int x,y,i;
    for(i=1;i<=n;i++)
    {
        f>>x>>y;
        adaug(l[x],y);
    }
}
void DF(int i)
{
    nod *c;
    viz[i]=1;
    for(c=l[i];c;c=c->urm)
        if(!viz[c->inf])
            DF(c->inf);
    v[++k]=i;
}
int main()
{citire();
for(int i=1;i<=n;++i)
    if(!viz[i]) DF(i);
for(int i=k;i>=1;i--)
    cout<<v[i]<<" ";
    return 0;
}