#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll,ll>;
using ld=long double;
const ll INF=(1ll<<60);
#define rep(i,n) for (ll i=0;i<(ll)(n);i++)
#define all(v) v.begin(),v.end()
template<class T> inline bool chmin(T &a,T b){
    if(a>b){
        a=b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T &a,T b){
    if(a<b){
        a=b;
        return true;
    }
    return false;
}
vector<vector<ll>> g;
vector<ll> vis;
string ans;
void dfs(ll x){
    if(vis[x]) return;
    vis[x]=true;
    if(x!=0) ans+="(";
    for(auto i:g[x]){
        dfs(i);
    }
    if(x!=0) ans+="methyl)";
    else ans+="methane";
    
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll n;
    cin >> n;
    g.resize(n);
    vis.resize(n,false);
    rep(i,n){
        rep(j,4){
            string s;
            cin >> s;
            if(s!="H"){
                ll x=stoll(s);
                x--;
                g[i].push_back(x);
            }
        }
    }
    dfs(0);
    cout << ans << '\n';
}