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#include <iostream>

int main() {
    std::ios_base::sync_with_stdio(0);

    int n;
    std::cin >> n;
    int k = 0;
    int i=0;
    while (n--) {
        ++i;
        std::string y;
        int x;
        std::cin >> y >> x;
        if (y == "NIE") continue;
        if (k < 20 && (k < 10 || x < 2)) {
            ++k;
            std::cout << i << " ";
        }
    }
    
    return 0;
}