import sys
sys.setrecursionlimit(10**6)
from collections import deque
N = int(input())
G = {i:[] for i in range(1,N+1)}
Num =set({str(i):i for i in range(1,N+1)})
for i in range(1,N+1):
    a,b,c,d = input().split()
    if a in Num:
        G[i].append(int(a))
    if b in Num:
        G[i].append(int(b))
    if c in Num:
        G[i].append(int(c))
    if d in Num:
        G[i].append(int(d))
ans = deque(["methane"])
def dfs(i,pi):
    for j in G[i]:
        if j==pi:continue
        ans.appendleft(("methyl)"))
        dfs(j,i)
        ans.appendleft("(")
dfs(1,0)
print("".join(ans))