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#include <bits/stdc++.h>
using namespace std;
int n;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    string s;
    int a;
    int cnt = 0;
    cin >> n;
    for (int i = 1; i <= n; ++i)
    {
        cin >> s >> a;
        if (s == "NIE") continue;
        if (cnt >= 10 && a >= 2) continue;
        if (cnt >= 20) continue;
        cout << i << " ";
        ++cnt;
    }
}