#include <bits/stdc++.h>

#include <atcoder/all>
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define FAST_IO                \
  ios::sync_with_stdio(false); \
  cin.tie(0);
const i64 INF = 1001001001001001001;
using Modint = atcoder::static_modint<998244353>;

void dfs(int v, vector<vector<int>> &G, vector<bool> &visited, vector<string> &ret) {
  visited[v] = true;
  for (int u : G[v]) {
    if (visited[u]) continue;

    ret.push_back("(");
    dfs(u, G, visited, ret);
    ret.push_back(")");
  }
  ret.push_back("methyl");
}

int main() {
  FAST_IO
  auto ans = 0LL;

  int N;
  cin >> N;

  vector<vector<int>> G(N);
  for (int i = 0; i < N; i++) {
    string C1, C2, C3, C4;
    cin >> C1 >> C2 >> C3 >> C4;
    if (C1 != "H") {
      G[i].push_back(stoi(C1) - 1);
    }
    if (C2 != "H") {
      G[i].push_back(stoi(C2) - 1);
    }
    if (C3 != "H") {
      G[i].push_back(stoi(C3) - 1);
    }
    if (C4 != "H") {
      G[i].push_back(stoi(C4) - 1);
    }
  }

  auto visited = vector<bool>(N, false);
  vector<string> ret;
  dfs(0, G, visited, ret);

  ret.pop_back();
  ret.push_back("methane");
  for (auto v : ret) {
    cout << v;
  }
  cout << endl;
}