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

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