#include <iostream>

#include <bits/stdc++.h>

using namespace std;

vector<int> actselection(int N, int* s, int* e);

bool sortbysec(pair<int, int> a, pair<int, int> b){return a.second < b.second;}

int main(){

int N;

cin >> N;

int s[N], e[N];

for(int i = 0; i < N; i ++){

cin >> s[i];

}

for (int i = 0; i < N; i ++){

cin >> e[i];

}

vector<int> ans;

ans = actselection(N, s, e);

cout << ans.size() << endl;

sort(ans.begin(), ans.end());

for(int i = 0; i < ans.size(); i ++){

cout << ans[i] << " ";

}

}

vector<int> actselection(int N, int* s, int* e){

int cur_finish = -1;

vector<pair<int, int> > act;

vector<pair<int, int> > select;

vector<int> sltinx;

for (int i = 0; i < N; i ++){

act.push_back(make_pair(s[i], e[i]));

}

sort(act.begin(), act.end(), sortbysec);

for (int i = 0; i < N; i ++){

if (act[i].first >= cur_finish){

select.push_back(act[i]);

cur_finish = act[i].second;

}

}

for (int i = 0; i < select.size(); i ++){

for (int j = 0; j < N; j ++){

if (select[i].first == s[j] && select[i].second == e[j]){

sltinx.push_back(j+1);

break;

}

}

}

return sltinx;

}