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#include <iostream>

int main() {
    size_t n;
    std::cin >> n;
    
    size_t p = 0;
    for (size_t i = 1; i < n + 1; i++) {
        if (p == 20) break;
        
        char s[4];
        std::cin >> s;

        int x;
        std::cin >> x;

        if (s[0] == 'N')
            continue;

        if (p < 10) {
            p++;
            std::cout << i << " ";
        } else if (x < 2) {
                p++;
                std::cout << i << " ";
        }
    }
}