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#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

typedef long long ll;

#define f(a, c, b) for(int a = c; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	int n;
	int ile = 0;
	cin >> n;
	string a;
	int x;
	f(i, 0, n) {
		cin >> a;
		cin >> x;
		if (a == "NIE") continue;
		if (ile < 10) {
			cout << i + 1 << " ";
			ile++;
		} else {
			if (x >= 2) continue;
			cout << i + 1 << " ";
			ile++;
			if (ile == 20) return 0;
		}
	}
	return 0;
}