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#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second
#define fast ios::sync_with_stdio(false); cin.tie(0); cout.tie(0)

void solve() {
    int n;
    cin>>n;
    vector<int>res;
    for(int i=0;i<n;i++){
        string s;
        int x;
        cin>>s>>x;
        if(s=="NIE")continue;
        if(res.size()<10 || x<2)res.push_back(i+1);
        if(res.size()==20)break;
    }
    for(auto x:res)cout<<x<<' ';
}
 
int main() {
    fast;
    //int z;
    //cin>>z;
    //while (z--) {
        solve();
    //}
}