#include <bits/stdc++.h>

using namespace std;

ifstream fin("sortaret.in");
ofstream fout("sortaret.out");

vector <int> mv[50005];
deque <int> q;
int viz[50005];
int n,m;

void BFS(int x){
    int i;

    q.push_back(x);
    viz[x]=1;
    fout<<x<<" ";

    while(!q.empty()){
        x=q.front();
        q.pop_front();

        for(i=0;i<mv[x].size();i++)
            if(!viz[mv[x][i]]){
                viz[mv[x][i]]=1;
                q.push_front(mv[x][i]);
                fout<<mv[x][i]<<" ";
            }
    }
}

int main(){
    int i,x,y;

    fin>>n>>m;

    for(i=1;i<=m;i++){
        fin>>x>>y;
        mv[x].push_back(y);
    }

    for(i=1;i<=n;i++)
        if(!viz[i])
            BFS(i);

    return 0;
}