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

void solve() {
    int n; cin >> n;
    int count = 0;
    for (int i = 0; i < n; i++) {
        string s; cin >> s;
        int x; cin >> x;
        if (s == "NIE") {
            continue;
        }
        if (x > 1 && count >= 10) {
            continue;
        }
        cout << i + 1 << " ";
        count++;
        if (count == 20) {
            break;
        }
    }
    cout << "\n";
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
}