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#include <bits/stdc++.h>

using namespace std;

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

    int n;
    cin >> n;

    int idx = 0;

    for (int i = 1; i <= n; ++i)
    {
        string s;
        int x;
        cin >> s >> x;
        if (s == "NIE") continue;
        if (idx < 10 || (idx < 20 && x < 2))
        {
            cout << i << ' ';
            ++idx;
        }
    }
    cout << '\n';
}