#include <bits/stdc++.h>
using namespace std;
int main(){
	int N;
	cin >> N;
	vector<vector<int>> G(N);
	for (int i = 0; i < N; i++){
		for (int j = 0; j < 4; j++){
			string s;
			cin >> s;
			if (s != "H"){
				int v = stoi(s) - 1;
				G[i].push_back(v);
			}
		}
	}
	auto dfs = [&](auto dfs, int v, int c) -> string {
		string T;
		if (v != 0){
			T += '(';
		}
		for (int i : G[v]){
			if (i == c){
				continue;
			}
			T += dfs(dfs, i, v);
		}
		if (v != 0){
			T += "methyl)";
		}
		return T;
	};
	string ans = dfs(dfs, 0, -1) + "methane";
	cout << ans << endl;
}