#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") {
                continue;
            }
            int x = stoi(s) - 1;
            G[i].push_back(x);
        }
    }
    vector<bool> seen(n, false);
    auto dfs = [&](auto dfs, int u) -> void {
        seen.at(u) = true;
        if (u) cout << "(";
        for (const auto &to : G.at(u)) {
            if (seen.at(to)) continue;
            dfs(dfs, to);
        }
        if (u) cout << "methyl)";
    };
    dfs(dfs, 0);
    cout << "methane" << endl;
}