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#include <iostream>
using namespace std;

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);

  int n;
  cin >> n;
  int found = 0;

  for (int i = 1; i <= n; i++) {
    string s;
    int x;

    cin >> s >> x;

    if (s == "NIE") continue;

    if (found < 10) {
      cout << i << ' ';
      found++;
    }

    else if (found < 20) {
      if (x > 1) continue;

      cout << i << ' ';
      found++;
    } else
      break;
  }
}