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#include <bits/stdc++.h>

using namespace std;

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

    int n;
    cin >> n;
    int contestants = 0;
    for (int i = 0; i < n; i++)
    {
        string boolean;
        int starts;
        cin >> boolean >> starts;

        if (boolean == "NIE")
            continue;

        if (contestants < 10)
        {
            contestants++;
            cout << i + 1 << ' ';
        }
        else if (contestants < 20)
        {
            if (starts >= 2)
                continue;
            contestants++;
            cout << i + 1 << ' ';
        }
        else
        {
            cout << '\n';
            return 0;
        }
    }
    return 0;
}