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#include<iostream>
#include<string>
#include<set>
#include<vector>
#include<map>

using namespace std;

typedef long long ll;

int main () {
    int a, x = 0;
    cin >> a;
    a = 0;
    while (a<20) {
        ++x;
        string s;
        int b;
        cin >> s >> b;
        if (s == "NIE")
            continue;
        if (b>=2 && a>=10)
            continue;
        cout << x << " ";
        ++a;
    }
}