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#include <iostream>
#include <string>
using namespace std;

int32_t main() {
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;

    int finalisci = 0;
    for (int i = 1; i <= n; ++i) {
        string s;
        int x;
        cin >> s >> x;
        if (s == "NIE") continue;
        if (finalisci < 10 || (finalisci < 20 && x < 2)) {
            ++finalisci;
            cout << i << " ";
        }
    }

    cout << "\n";
}