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#include <iostream>

using namespace std;

int n, x, rem = 20;
string s;

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

    cin >> n;

    for(int i = 1; i <= n; ++i)
    {
        cin >> s >> x;

        if(s == "NIE") 
        {
            continue;
        }

        if(rem > 10) 
        {
            cout << i << ' ';
            --rem;
        }
        else if(x < 2)
        {
            cout << i << ' ';
            --rem;
        }

        if(rem == 0)
        {
            cout << endl;
            return 0;
        }
    }
}