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#include <iostream>

using namespace std;

int n;

int main() {
    cin >> n;
    int top10 = 10;
    int top20 = 20;
    string tak_nie;
    for (int i = 1; i <= n; i++) {
        int ile;
        cin >> tak_nie >> ile;
        if (tak_nie[0] == 'N') {
            continue;
        }
        if (top10 > 0) {
            if (top10 == 10) {
                cout << i;
            } else {
                cout << " " << i;
            }
            top10--;
            top20--;       
        } else if (top20 > 0) {
            if (ile >= 2) {
                continue;
            } else {
                if (top20 == 1) {
                    cout << " " << i << endl;
                } else {
                    cout << " " << i;
                }
                top20--;
            }
        }
    }
    return 0;
}