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

int main() {
    int n; cin >> n;
    vector<int> res;
    for (int k = 1; k <= n; k++) {
        string s; cin >> s;
        int p; cin >> p;
        if (s == "NIE") continue;
        if (int(res.size()) >= 10 && p >= 2) continue;
        if (int(res.size()) < 20) res.push_back(k);
    }
    for (int i = 0; i < 20; i++) {
        cout << res[i] << " \n"[i==19];
    }
}