#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    cin >> n;
    string str;
    int p;
    int c = 0;
    for (int i = 0; i < n; i++)
    {
        cin >> str >> p;
        if (str == "NIE")
            continue;
        if (c < 10)
        {
            cout << i + 1 << " ";
            c++;
        }
        else if (c < 20 && p < 2)
        {
            cout << i + 1 << " ";
            c++;
        }
    }
    return 0;
}