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#include <bits/stdc++.h>

using namespace std;

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

    int n;
    cin >> n;

    int cnt = 0, id = 0;
    string check;
    int finals;
    
    while (n--) {
        id++; 
        cin >> check >> finals;
        if (check == "NIE")
            continue;
        if (cnt < 10 || (cnt < 20 && finals < 2)) {
            cout << id << " ";
            cnt++;
        }
    }
}