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#include <iostream>

using namespace std;

int n;

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

    cin >> n;

    int res = 0;
    for(int i = 0; i < n; i++) {
        string can;
        int count;
        cin >> can >> count;
        if(can[0] == 'N') {
            continue;
        }
        if(res < 10 || count < 2) {
            if(res > 0) {
                cout << " ";
            }
            cout << (i+1);
            res++;
            if(res == 20) {
                break;
            }
        }
    }

    return 0;
}