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#include <bits/stdc++.h>
using namespace std;

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int n;
	cin >> n;
	vector<int> v;
	string s;
	int x;
	for(int i = 0; i < n; i++){
		cin >> s >> x;
		if(s == "NIE") continue;
		if(v.size() >= 10 && x >= 2) continue;
		v.push_back(i+1);
		if(v.size() >= 20) break;
	}
	for(auto& i : v) cout << i << " ";
}