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#include <bits/stdc++.h>
using namespace std;

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

    int n;
    cin >> n;

    int count = 0;
    for (int i = 0; i < n; i++){
        int il; string dekl;
        cin >> dekl >> il;
        if (dekl == "NIE"){
            continue;
        }
        else if(count >= 10 && il >= 2){
            continue;
        }

        count++;
        cout << i + 1 << " ";
        if(count == 20){
            break;
        }
    }

    return 0;
}