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#include <iostream>
#include <cstdio>
#include <vector>
using namespace std;

const int MX = 8005;
char S[MX];
int L1[MX];
int L2[MX];

int main()
{
    string s;
    int n,x;
    cin>>n;
    int a = 0;
    for (int i =0; i < n; i++)
    {
        cin>>s>>x;
        if (s == "NIE") continue;
        if (a<10)
        {
            a++;
            cout << i + 1<< " ";
        }
        else if (a<20 && x < 2)
        {
            a++;
            cout << i +1 << " ";
        }
    }
    cout << endl;


    return 0;
}