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#include <iostream>
using namespace std;

int main() {
    int n, v, c = 0;
    string s;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> s >> v;
        if (s != "NIE") {
            if (c < 10 or v < 2) {
                cout << i + 1 << " ";
                c++;
            }
            if (c == 20) return 0;
        }
    }
}