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

vector<vector<int>> G;

string dfs(int const u, int const p) {
  string ret;
  for (int const v : G[u])
    if (v != p) {
      string sub{dfs(v, u)};
      for (int i=0; i < 3; ++i)
        sub.pop_back();
      ret += "(" + sub + "yl)";
    }
  ret += "methane";
  return ret;
}

int main() {
  int N;
  cin >> N;
  G.resize(N);
  for (int u=0; u < N; ++u)
    for (int i=0; i < 4; ++i) {
      string C;
      cin >> C;
      if (C != "H") {
        int const v{stoi(C) - 1};
        G[u].push_back(v);
      }
    }

  cout << dfs(0, -1) << endl;
}