n=int(input())
g=[[] for _ in range(n)]
for i in range(n):
  c=input().split()
  for j in c:
    if j=='H':
      continue
    g[i].append(int(j)-1)
    
ans=[]

dq=[~0,0]
check=[0]*n
check[0]=1
while dq:
  v=dq.pop()
  if v>0:
    ans.append('(')
  if v<0:
    if v==-1:
      ans.append('methane')
    else:
      ans.append('methyl)')
    continue
  for i in g[v]:
    if check[i]:
      continue
    check[i]=1
    dq.append(~i)
    dq.append(i)
    
print(''.join(ans))