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//Piotr Kowalski 2D
#include <bits/stdc++.h>
using namespace std;

int tab[10001];

int main() {
    int n;
    cin >> n;
    int l=0;
    string s;
    int x;
    for (int i=0;i<n;i++) {
        tab[i] = 0;
        cin >> s;
        cin >> x;
        if (l>=20) {
            continue;
        }
        if (s=="NIE") {
            continue;
        }
        if (x>=2 && l>=10) {
            continue;
        }
        l++;
        tab[i] = 1;
    }
    for (int i=0;i<n;i++) {
        if (tab[i] == 1) {
            cout << i+1 << " ";
        }
    }
	return 0;
}