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

int main(){
	cin.tie(NULL);
	ios_base::sync_with_stdio(false);
	int N;
	cin >> N;

	int current_place = 0;
	string s;
	int x;
	for(int i = 0; i < N; i++){
		cin >> s >> x;
		if(current_place >= 20 || (current_place >= 10 && x >= 2) || s[0] == 'N') continue;
		cout << i + 1 << ' ';
		current_place++;
	}
	cout << endl;
}