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

int main() {
    int n, y = 0;
    cin >> n;
    vector<bool> v(n+1, 1);
    for(int i = 1; i <=n; i++){
        string s;
        int x;
        cin >> s >> x;
        if(s == "NIE")v[i] = 0;
        else if(y <= 10) y++;
        if(y> 10 && x > 1) v[i] = 0;
    }
    y = 0;
    for(int i = 1; i <= n; i++){
        if(y==20) break;
        if(v[i] == 1){ cout << i << ' '; y++;}
    }
}