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// clang-format off
#include<bits/stdc++.h>
using namespace std;
using LL=long long;
#define FOR(i,l,r) for(auto i=(l);i<=(r);++i)
#define REP(i,n) FOR(i,0,(n)-1)
#define ssize(x) int(x.size())
template<class A,class B>auto&operator<<(ostream&o,pair<A,B>p){return o<<"("<<p.first<<", "<<p.second<<")";}
template<class T>auto operator<<(ostream&o,T x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<(", ")+2*!i++<<e;return o<<"}";}
#ifdef DEBUG
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<"\n";}(X)
#else
#define debug(...) {}
#endif
// clang-format on

int
main()
{
    cin.tie(0)->sync_with_stdio(0);
    int N, x;
    string s;
    cin >> N;
    vector<int> ans;
    FOR (i, 1, N) {
        cin >> s >> x;
        if (s == "NIE") continue;
        if (ssize(ans) < 10 || x < 2) ans.emplace_back(i);
        if (ssize(ans) == 20) break;
    }
    for (const auto& x : ans) cout << x << " ";
    cout << "\n";
    return 0;
}