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

using namespace std;

int main()
{
    int n, x;
    string s;
    cin >> n;

    vector<int> res;

    for (int i = 1; i <= n; ++i)
    {
        cin >> s >> x;

        if (s == "NIE")
            continue;

        if (res.size() < 10 || x < 2)
            res.push_back(i);

        if (res.size() == 20)
            break;
    }

    for (size_t i = 0; i < res.size(); ++i)
    {
        cout << (i == 0 ? "" : " ") << res[i];
    }

    cout << endl;

    return 0;
}