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#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define BOOST ios_base::sync_with_stdio(0), cin.tie(0)
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;

int main(){
	BOOST;
	int n; cin >> n;
	vector<int> finals;
	for(int i=1; i<=n; i++){
		string s; cin >> s;
		int x; cin >> x;
		if(s == "NIE") continue;
		if(finals.size() < 10){
			finals.pb(i);
		}
		else if(finals.size() < 20 && x < 2){
			finals.pb(i);
		}
	}
	for(auto it : finals){
		cout << it << " ";
	}
	cout << "\n";
}