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#include <bits/stdc++.h> 
using namespace std;
#define st first
#define nd second
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;



int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int N; string S; int X;
    cin >> N;
    vector <int > V;
    for(int i = 0; i  < N ; i++)
    {
        cin >> S >> X;
        if(S == "NIE")continue;
        if(V.size() < 10)
        {
            V.push_back(i+1);
        }
        else if(V.size() < 20)
        {
            if(X < 2)V.push_back(i+1);
        }
    }

    for(auto p : V)cout << p << ' ';
    return 0;
}