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#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) {}
#endif

#define x first
#define y second
#define ir(a, x, b) ((a) <= (x) && (x) <= (b))
#define vec vector
#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define all(x) (x).begin(), (x).end()

using ll = long long;

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int N;
    cin >> N;
    vec<int> res;
    rep (n, 0, N) {
        int ct = res.size();

        string s;
        int x; 
        cin >> s;
        cin >> x;

        if (ct >= 20) continue;
        if (s == "NIE") continue;
        if (x >= 2 && ct >= 10) continue;
        res.push_back(n);
    }
    for (auto x : res) {
        cout << x+1 << " ";
    }
    cout << "\n";
    return 0;
}