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#include <bits/stdc++.h>
using namespace std;

using vi = vector<int>;

int main() {
    int n;
    cin >> n;
    vi ans;
    for (size_t i = 0; i < n; i++)
    {
        string s;
        int x;
        cin >> s >> x;
        int n_qualified = ans.size();
        if(n_qualified >= 20) continue;
        if (s == "NIE") continue;
        bool start_rejecting_old = n_qualified >= 10;
        bool too_old = start_rejecting_old && x >= 2;
        if (too_old) continue;
        ans.push_back(i + 1);
    }
    for (size_t i = 0; i < ans.size(); i++)
    {
        cout << ans[i] << ' ';
    }
    return 0;
}