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#include<iostream>
#include<string>
using namespace std;

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

    int n;
    cin >> n;

    int cnt = 0;
    for (int i = 0; i < n; i++) {
        string s;
        int k;
        cin >> s >> k;
        if (s == "NIE") continue;
        if (cnt < 10 || k < 2) {
            cout << i + 1 << " ";
            cnt++;
        }
        if (cnt == 20) {
            break;
        }
    }
    
    return 0;
}