#include <iostream>
#include <vector>
#include <string>
using namespace std;

const int MAX_N = 200000;
int N;
string tmp;
int C;
int edges[MAX_N][4];
bool used[MAX_N];
string iupac(int);

int main() {
    cin >> N;
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < 4; j++) {
            cin >> tmp;
            if (tmp != "H") {
                C = stoi(tmp);
                edges[i][j] = C - 1;
            } else
                edges[i][j] = -1;
        }
    }
    cout << iupac(0) << endl;
    return 0;
}

string iupac(int r) {
    used[r] = true;
    string ans;
    for (int i = 0; i < 4; i++) {
        if (edges[r][i] >= 0 && !used[edges[r][i]]) {
            string tmp = iupac(edges[r][i]);
            ans += "(" + tmp.substr(0, tmp.size() - 3) + "yl)";
        }
    }
    ans += "methane";
    return ans;
}