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#include <iostream>

using namespace std;

int main()
{
    int num_all;
    cin >> num_all;
    string ret = "";
    int counter = 0;
    bool isFinished = false;

    for(int i = 1; i <= num_all; i++){
        string move_on;
        int participated;
        cin >> move_on;
        cin >> participated;
        if(isFinished || move_on == "NIE" || (counter > 10 && participated >= 2)) continue;
        ret += to_string(i) + " ";
        counter++;
        if(counter >= 20) isFinished = true;
    }
    cout << ret;
    return 0;
}