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#include <vector>
#include <iostream>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);

    int n;
    cin >> n;
    int cnt = 0;
    string decision;
    int times;
    int count = 0;

    while (n--) {
        cnt += 1;
        cin >> decision >> times;
        if (count == 20) {
            break;
        }
        if (decision == "NIE") {
            continue;
        }
        if (count < 10) {
            cout << cnt << " ";
            count += 1;
        } else {
            if (times < 2) {
                cout << cnt << " ";
                count += 1;
            }
        }
    }
    cout << endl;


    return 0;
}