/*
_ _ _______ _ _
| | / / | _____| | | / /
| | / / | | | | / /
| |/ / | |_____ | |/ /
| |\ \ | _____| | |\ \
| | \ \ | | | | \ \
| | \ \ | |_____ | | \ \
|_| \_\ |_______| |_| \_\
*/
#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef double ld;
typedef pair <int, int> PII;
typedef pair <ll, ll> PLL;
typedef pair < ll, int > PLI;
#define F first
#define S second
#define pb push_back
#define eb emplace_back
#define right(x) x << 1 | 1
#define left(x) x << 1
#define forn(x, a, b) for (int x = a; x <= b; ++x)
#define for1(x, a, b) for (int x = a; x >= b; --x)
#define mkp make_pair
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define y1 kekekek
#define fname ""
const ll ool = 1e18 + 9;
const int oo = 1e9 + 9, base = 1e9 + 7;
const ld eps = 1e-7;
const int N = 2e3 + 6;
int n, sz;
bitset < N > par[N], bad[N];
map < string, int > mp;
int main() {
ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
#ifdef krauch
freopen("input.txt", "r", stdin);
#else
//freopen(fname".in", "r", stdin);
//freopen(fname".out", "w", stdout);
#endif
cin >> n;
forn(i, 1, n) {
string s;
getline(cin, s);
if (i == 1) getline(cin, s);
int ptr = 0;
string vname = "";
bool fu = 0;
while (s[ptr] != ' ') {
vname += s[ptr];
++ptr;
}
ptr += 3;
if (mp.count(vname)) fu = 1;
vector < int > tmp;
string toname = "";
while (s[ptr] != ';') {
if (s[ptr] == ' ') {
if (!mp.count(toname)) fu = 1;
else tmp.eb(mp[toname]);
toname = "";
}
else {
toname += s[ptr];
}
++ptr;
}
if (fu) {
cout << "greska\n";
continue;
}
bitset < N > bit;
for (auto it : tmp) {
bit |= par[it];
}
forn(i, 1, sz) {
if (!bit[i]) continue;
if ((bad[i] & bit).count()) fu = 1;
}
if (fu) {
cout << "greska\n";
continue;
}
++sz;
mp[vname] = sz;
par[sz] = bit;
par[sz][sz] = 1;
forn(i, 1, sz) {
if (par[sz][i]) continue;
if ((par[sz] & par[i]).count()) bad[sz][i] = 1;
}
cout << "ok\n";
}
return 0;
}
