#include <bits/stdc++.h>
using namespace std;

string dfs(const vector<vector<int>> &G, int v, vector<bool> &visited) {
	visited[v] = true;
	string str;
	for (int u : G[v]) {
		if (!visited[u]) {
			string s = dfs(G, u, visited);
			str += ("(" + s.substr(0, s.size() - 3) + "yl)");
		}
	}
	return str + "methane";
}

int main() {
	int n;
	cin >> n;
	vector<vector<int>> C(n);
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < 4; j++) {
			string s;
			cin >> s;
			if (s != "H") {
				C[i].push_back(stoi(s) - 1);
			}

		}
	}
	vector<bool> visited(n, false);
	if(n<10000)	cout << dfs(C, 0, visited) << endl;
	return 0;
}