#include <bits/stdc++.h>
//#include <atcoder/all>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define Max(v) *max_element(all(v))
#define Min(v) *min_element(all(v))
#define yn(flag) if (flag) {cout << "Yes\n";} else {cout << "No\n";}
using namespace std;
//using namespace atcoder;
using str = string;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
using vint = vector<int>;
using vvint = vector<vector<int>>;
using vll = vector<ll>;
using vvll = vector<vector<ll>>;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
//using mint = modint998244353;
//using mint = modint1000000007;
template<class T> inline bool chmin(T& a, T b) {if (a > b) {a = b; return true;} return false;}
template<class T> inline bool chmax(T& a, T b) {if (a < b) {a = b; return true;} return false;}
const ll INF = 1LL << 60;
const ll mINF = -1 * INF;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    //cout << fixed << setprecision(16);

    int N; cin >> N;
    int k = N / 11;
    vector<str> KCPC = {"#...#.#####",
                        "#.##..#....",
                        "##....#....",
                        "#.##..#....",
                        "#...#.#####",
                        "...........",
                        "####..#####",
                        "#...#.#....",
                        "####..#....",
                        "#.....#....",
                        "#.....#####"};
    vector<str> KUPC = {"#...#.#...#",
                        "#.##..#...#",
                        "##....#...#",
                        "#.##..#...#",
                        "#...#.#####",
                        "...........",
                        "####..#####",
                        "#...#.#....",
                        "####..#....",
                        "#.....#....",
                        "#.....#####"};

    vector<str> S(11);
    for (int i = 0; i < N; ++i) {
        str s = "";
        for (int j = 0; j < N; ++j) {
            char c; cin >> c;
            if (!(j % k)) s += c;
        }
        if (!(i % k)) {
            S[i / k] = s;
            //cout << s << "\n";
        }
    }

    if (S == KCPC) cout << "KCPC";
    else if (S == KUPC) cout << "KUPC";
    else cout << "error";

    return 0;
}