#include<fstream>
#include<list>
#include<deque>
#include<bitset>
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
const int VMAX=50005;
list<int>g[VMAX];
deque<int>sol;
bitset<VMAX>isNotIsolated;
int vertices,edges;
void read_data(){
    int from,to;
    fin>>vertices>>edges;
    while(edges--){
        fin>>from>>to;
        g[from].push_back(to);
    }
}
void BFS(){
    int i,v;
    deque<int>d;
    list<int>:: iterator next_node;
    for(i=1;i<=vertices;++i)
        if(g[i].size()&&!isNotIsolated[i]){
            d.push_back(i);
            isNotIsolated[i]=1;
            sol.push_back(i);
            while(!d.empty()){
                v=d.front();
                d.pop_front();
                for(next_node=g[v].begin();next_node!=g[v].end();++next_node)
                    if(!isNotIsolated[*next_node]){
                    isNotIsolated[*next_node]=1;
                    d.push_back(*next_node);
                    sol.push_back(*next_node);
                }
            }
        }
}
void print(){
    while(!sol.empty()){
        fout<<sol.front()<<' ';
        sol.pop_front();
    }
    int i;
    for(i=1;i<=vertices;++i)
        if(!isNotIsolated[i])
            fout<<i<<' ';
}
int main(){
    read_data();
    BFS();
    print();
}