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#include <iostream>

int main() {
    int32_t n;
    std::cin >> n;

    int32_t outputted = 0;
    for (int32_t i = 1; i <= n; ++i) {
        std::string s;
        int32_t x;
        std::cin >> s >> x;

        if (s == "NIE") { continue; }
        if (outputted == 20) { continue; }
        if (outputted >= 10 && x >= 2) { continue; }

        std::cout << (outputted > 0 ? " " : "") << i;
        outputted += 1;
    }
    std::cout << "\n";
}