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

void solve(){
    int n;
    cin >> n;
    int cnt = 0;
    string s;
    int x;
    for(int i = 0; i < n; ++i){
        if(cnt == 20) break;
        cin >> s >> x;
        if(s == "NIE") continue;
        if(cnt < 10){
            cout << i + 1 << " ";
            cnt++;
        }
        else{
            if(x >= 2) continue;
            cout << i + 1 << " ";
            cnt++;
        }
    }
    cout << "\n";
    return;
}

int main(){
    //ios_base::sync_with_stdio(0);
    //cin.tie(0);
    //cout.tie(0);
    int t;
    t = 1;
    while(t--){
        solve();
    }

    return 0;
}