#include <bits/stdc++.h>
using namespace std;
#define sz size()
#define ll long long
#define pb push_back
const int N = 3e5 + 5;
map <string, int> m;
int main () {
// freopen ("input.txt", "r", stdin);
ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n;
cin >> n;
for (int i = 1; i <= n; ++i) {
string s; char k;
cin >> s >> k;
// cout << "->" << s << "<-";
// return 0;
// cout << i << "--> " << s << " " << k << " ";
int tt = 0;
while (1) {
string y;
cin >> y;
if (y[0] == ';') break;
// if (i == 2) {
// cout << " oo ->" << y << "<-";
// return 0;
// }
if (m.find(y) == m.end()) {
tt = 1;
}
}
// if (i == 10) {
// cout <<
// }
if (tt == 1 or m.find (s) != m.end()) {
cout << "greska\n";
}
else {
cout << "ok\n";
m[s] = 1;
}
}
}
