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signed main(){
    fastio;
    int t=1;
    //cin >> t;
    while(t--){
        int n,m;
        cin>>n>>m;
        vvi adj(n+1);
        vi indeg(n+1,0);
        for(int i=0;i<m;i++){
            int u,v;
            cin>>u>>v;
            adj[u].pb(v);
            indeg[v]++;
        }
        queue<int> q;

        for(int i=1;i<=n;i++){
            if(indeg[i] ==0){
                q.push(i);
            }
        }
        vi topo;
        while(!q.empty()){
            int u = q.front();
            q.pop();
            topo.pb(u);
            for(int v:adj[u]){
                indeg[v]--;
                if(indeg[v] == 0){
                    q.push(v);
                }
            }
        }
        if(sz(topo)==n){
            for(int v:topo){
                cout << v << " ";
            }
            cout << endl;
        }
        else{
            cout << -1 << endl;
        }
    }
}