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#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
using LL=long long;
using LD=long double;
#define FOR(i,l,r) for(auto i=(l);i<=(r);++i)
#define ROF(i,l,r) for(auto i=(l);i>=(r);--i)
#define REP(i,n) FOR(i,0,(n)-1)
#define ITF(e,c) for(auto&e:(c))
#define ssize(x) int(x.size())
#ifdef DEBUG
auto operator<<(auto&o,auto p)->decltype(p.first,o){return o<<'('<<p.first<<", "<<p.second<<')';}
auto operator<<(auto&o,auto&x)->decltype(x.end(),o){o<<'{';int i=0;for(auto e:x)o<<(", ")+2*!i++<<e;return o<<'}';}
#define debug(x...) cerr<<"["#x"]: ",[](auto...$){((cerr<<$<<"; "),...);}(x),cerr<<'\n'
#else
#define debug(...) {}
#endif

int main() {
  cin.tie(0)->sync_with_stdio(0);

  int N;
  cin>>N;
  int qct = 0;
  string want; int nst;
  FOR(i,1,N) {
    cin>>want>>nst;
    if (want=="NIE") continue;
    if (qct<10 || nst<2) {
      ++qct;
      cout << i << ' ';
    }
    if (qct==20) break;
  }
  cout << endl;

  return 0;
}