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#include <bits/stdc++.h>

using namespace std;

int main() {
    int n; cin >> n;
    vector<int> result;
    for(int i = 1; i <= n; i++) {
        string s; cin >> s;
        int x; cin >> x;
        if(s == "NIE") continue;
        else if (result.size() < 10) result.push_back(i);
        else if (result.size() < 20 && x < 2) result.push_back(i);
    }
    for(int i = 0; i < result.size(); i++) cout << result[i] << " ";
    return 0;
}