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#include <bits/stdc++.h>
using namespace std;
vector<int> sigma;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin >> n;
    for(int i = 0; i <n; i++){
        string data;
        int count;
        cin >> data >> count;
        if(data == "NIE"){
            continue;
        }
        if(sigma.size() < 10){
            sigma.push_back(i+1);
        }else{
            if(count < 2 and sigma.size() < 20){
                sigma.push_back(i+1);
            }
            if(sigma.size() == 20){
                break;
            }
        }
    }
    for(auto x: sigma){
        cout << x << " ";
    }
}