#include <cstdio>
#include <queue>
#include <vector>
#define nmx 50003
using namespace std;

int n,m,nrc[nmx];
vector <int> g[nmx];
queue <int> q;

void citire(){
    scanf("%d %d", &n, &m);
    int nod1,nod2;
    for(int i = 1; i <= n; ++i){
        scanf("%d %d", &nod1, &nod2);
        g[nod1].push_back(nod2);
        ++ nrc[nod2];
    }
}

void sortare_topologica(){
    for(int i = 1; i <= n; ++i)
        if(not nrc[i])
            q.push(i);

    int nod;
    while(not q.empty()){
        nod = q.front();
        q.pop();
        printf("%d ", nod);
        for(vector<int>::iterator it = g[nod].begin(); it != g[nod].end(); ++it){
            -- nrc[*it];
            if(not nrc[*it])
                q.push(*it);
        }
    }
}

int main(){
    freopen("sortaret.in", "r", stdin);
    freopen("sortaret.out", "w", stdout);

    citire();
    sortare_topologica();

    return 0;
}