#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
map<string, int> vis;
vector<bitset<1001>> anc(n + 1, 0);
int id = 1;
for (int i = 0; i < n; i++) {
string tmp;
getline(cin >> ws, tmp);
stringstream ss;
ss << tmp;
string s, K;
ss >> K;
if (vis[K]) {
cout << "greska" << '\n';
continue;
}
ss >> s;
vector<int> v;
int bl = 1;
while (1) {
ss >> s;
if (s == ";") {
break;
}
if (!vis[s]) {
bl = 0;
break;
}
v.push_back(vis[s]);
}
if (!bl) {
cout << "greska" << '\n';
continue;
}
int m = v.size();
for (int ii = 0; ii < m; ii++) {
for (int j = ii + 1; j < m; j++) {
if (anc[v[ii]][v[j]] || anc[v[j]][v[ii]]) {
continue;
}
if ((anc[v[ii]] & anc[v[j]]) != 0) {
bl = 0;
break;
}
}
if (!bl) {
break;
}
}
if (!bl) {
cout << "greska" << '\n';
continue;
}
for (int ii = 0; ii < m; ii++) {
anc[id] |= anc[v[ii]];
anc[id][v[ii]] = 1;
}
vis[K] = id++;
cout << "ok" << '\n';
}
return 0;
}
