#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n;
    cin >> n;
    vector<vector<int>> g(n);
    rep(i,n) {
        rep(j,4) {
            string c;
            cin >> c;
            if(c=="H") continue;
            int id = stoi(c);
            id--;
            g[i].push_back(id);
        }
    }
    auto dfs = [&](auto dfs, int u, int p=-1) -> string {
        string ret;
        for(int v : g[u]) {
            if(v==p) continue;
            string res = dfs(dfs, v, u);
            res.pop_back();
            res.pop_back();
            res.pop_back();
            ret += "(";
            ret += res;
            ret += "yl)";
        }
        ret += "methane";
        return ret;
    };
    cout << dfs(dfs, 0) << endl;
    return 0; 
}