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

void dfs(const vector<vector<int>> &G, int v, vector<bool> &visited) {
	visited[v] = true;
	string str;
	for (int u : G[v]) {
		if (!visited[u]) {
		    cout << "(";
			dfs(G, u, visited);
			cout << "methyl)";
		}
	}
}

int main() {
#ifndef NDEBUG
	clock_t clockt = clock();
#endif
	int n;
#ifdef NDEBUG
	cin >> n;
#else
	n = 20000;
#endif
	vector<vector<int>> C(n);
	for (int i = 0; i < n; i++) {
#ifdef NDEBUG
		for (int j = 0; j < 4; j++) {
			string s;
			cin >> s;
			if (s != "H") {
				C[i].push_back(stoi(s) - 1);
			}
		}
#else
		if (i > 0)
			C[i].push_back(i - 1);
		if (i < n - 1)
			C[i].push_back(i + 1);
#endif
	}
	vector<bool> visited(n, false);
	dfs(C, 0, visited);
	cout << "methane" << endl;
#ifndef NDEBUG
	cerr << "took " << (double) (clock() - clockt) / CLOCKS_PER_SEC << " sec." << endl;
#endif
	return 0;
}