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

#define mp make_pair
#define pb push_back
#define st first
#define nd second
#define fi first
#define se second
#define vt vector
#define FOR(a, b, c)  for(int a=b; a<c; ++a)
#define all(a)     (a).begin(),(a).end()
#define sz(a)      (int)(a).size()

typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef vector<int> vi; 
typedef vector<ll> vll;
typedef pii PII;
typedef pll PLL;

constexpr ll nax = 2e5+6969, INF = 1e9+2137;
constexpr ld eps = 1e-9;

mt19937_64 rng(6969);
// mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());

inline ll rand(ll l, ll r) {
	return uniform_int_distribution<ll>(l, r)(rng);
}


int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n; 
    cin >> n; 
    vi ans; 
    for(int i = 0; i < n; i++) {
        string s; 
        int x; 
        cin >> s >> x; 
        if(s == "NIE")
            continue; 
        if(ans.size() < 10) {
            ans.pb(i + 1); 
        }
        else if(ans.size() < 20 && x < 2){
            ans.pb(i + 1); 
        }
    }
    for(auto e: ans) {
        cout << e << " "; 
    }
    cout << "\n"; 

    return 0;
}