import sys
input = sys.stdin.readline

sys.setrecursionlimit(1000000)

N=int(input())
C=[input().split() for i in range(N)]

E=[[] for i in range(N)]


for i in range(N):
    for j in range(4):
        if C[i][j]=="H":
            continue
        x=int(C[i][j])-1
        E[i].append(x)

ANS=[]
USE=[0]*N

def dfs(x):
    USE[x]=1
    ANS.append("(")

    for to in E[x]:
        if USE[to]==0:
            USE[to]=1
            dfs(to)

    
    ANS.append("methyl")
    ANS.append(")")

dfs(0)

ANS=ANS[1:]
ANS.pop()
ANS[-1]="methane"

print("".join(ANS))