#include <bits/stdc++.h>
using namespace std;
#define all(v) (v).begin(),(v).end()
#define pb(a) push_back(a)
#define rep(i, n) for(int i=0;i<n;i++)
#define foa(e, v) for(auto& e : v)
using ll = long long;
const ll MOD7 = 1000000007, MOD998 = 998244353, INF = (1LL << 60);
#define dout(a) cout<<fixed<<setprecision(10)<<a<<endl;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    vector<vector<int>> v(n);
    rep(i, n) {
        rep(j, 4) {
            string s;
            cin >> s;
            if(s != "H") {
                int a = stoi(s) - 1;
                v[i].pb(a);
            }
        }
    }
    auto dfs = [&](auto dfs, int now, int p) -> void {
        if(p != -1) {
            cout << "(";
        }
        foa(e, v[now]) {
            if(e == p) continue;
            dfs(dfs, e, now);
        }
        if(p == -1) {
            cout << "methane" << endl;
        } else {
            cout << "methyl)";
        }
    };
    dfs(dfs, 0, -1);

    return 0;
}