#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 1000000000000000001
string ans = "";
void dfs(vector<vector<int>> &E,int v,int p){

	for(auto u:E[v]){
		if(u==p)continue;
		ans += "(";
		dfs(E,u,v);
	}
	if(p==-1){
		ans += "methane";
	}
	else{
		ans += "methyl)";
	}
}

int main(){
	
	int n;
	cin>>n;
	vector<vector<int>> E(n);
	rep(i,n){
		rep(j,4){
			string s;
			cin>>s;
			if(s=="H")continue;
			E[i].push_back(stoi(s)-1);
		}
	}
	dfs(E,0,-1);
    cout<<ans<<endl;
    return 0;
}