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#include <bits/stdc++.h>
using namespace std;
#define rep(a, b) for (int a = 0; a < (b); a++)
#define rep1(a, b) for (int a = 1; a <= (b); a++)
#define all(x) (x).begin(), (x).end()
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
const int MOD = 1e9 + 7;

#define LOCAL false

int n;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    if (LOCAL) {
        ignore=freopen("io/in", "r", stdin);
        ignore=freopen("io/out", "w", stdout);
    }

    cin >> n;
    vector<int> l2, ge2;
    string str;
    int cnt;
    int tot = 0;
    rep1(i, n) {
        cin >> str >> cnt;
        if (str == "NIE") continue;
        if (tot < 10 || (cnt < 2 && tot < 20)) {
            cout << i << " ";
            tot++;
        }
    }
    cout << "\n";

    return 0;
}