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#include <bits/stdc++.h>
#define LL long long
#define endl '\n'
using namespace std;
int main()
{
    std::ios_base::sync_with_stdio(0);
    cout.tie(0);
    cin.tie(0);

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