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#include <iostream>
#include <vector>
#include <string>

using namespace std;

void solve() {
    int n;
    vector<int> result;
    cin >> n;
    for(int i = 0; i < n; i++) {
        string isOk;
        int prevFin;
        cin >> isOk >> prevFin;
        if(result.size() == 20 || isOk == "NIE") {
            continue;
        } else if(result.size() < 10 || prevFin < 2) {
            result.push_back(i+1);
        }
    }

    for(auto const & r : result) {
        cout << r << " ";
    }
    cout << "\n";
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    solve();

    return 0;
}