#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main () {
    int N; cin >> N;
    vector<vector<int>> graph(N);
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < 4; j++) {
            string str; cin >> str;
            int to;
            try {
                to = stoi(str) - 1;
            }
            catch (...) {
                continue;
            }

            graph[i].push_back(to);
        }
    }

    auto dfs = [&] (auto self, int pos, int par) -> string {
        string res = "";
        for (auto nex: graph[pos]) {
            if (nex == par) continue;
            auto name = self(self, nex, pos);
            res += "(" + name.substr(0, name.size() - 3) + "yl)";
        }

        res += "methane";
        return res;
    };

    cout << dfs(dfs, 0, -1) << "\n";
}