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#include <bits/stdc++.h>

using namespace std;

#define ll long long 
#define ld long double

int main () {
    ios_base::sync_with_stdio(NULL);
    cin.tie(0);

    int ct = 0;
    int i = 0;

    int n;
    cin >> n;

    while (n--) {
        i++;
        string s;
        int x;
        cin >> s >> x;
        if (s == "NIE") continue;
        if (ct < 10) {
            cout << i << " ";
            ct++; 
        }
        else if (x < 2 && ct < 20) {
            cout << i << " ";
            ct++;
        }
    }

    return 0;
}