from collections import defaultdict
import sys

sys.setrecursionlimit(500000)
ans=[]
check=set([1])
path=defaultdict(list)
def dfs(i):
  if i!=1:
    ans.append("(")
  for j in path[i]:
    if j not in check:
      check.add(j)
      dfs(j)
  if i!=1:
    ans.append("methyl)")
  else:
    ans.append("methane")
N=int(input())
for i in range(1,N+1):
  a=list(map(str,input().split()))
  for j in range(4):
    if a[j]!="H" and i<int(a[j]):     
      path[i].append(int(a[j]))
      path[int(a[j])].append(i)
dfs(1)
print("".join(ans))