import sys
input = sys.stdin.readline

sys.setrecursionlimit(2000200)

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

USE=[0]*N

def dfs(x):
    USE[x]=1
    ANS=[]
    for i in range(4):
        if C[x][i]=="H":
            continue
        k=int(C[x][i])-1
        
        if USE[k]==1:
            continue

        X=dfs(k)

        if ANS==[] or len(X)<len(ANS):
            ANS.append("(")
            ANS+=X
            ANS.append(")")
        else:
            X.append("(")
            X+=ANS
            X.append(")")

            ANS=X
            

    ANS.append("methyl")

    #print(ANS)

    return ANS

ANS=dfs(0)

ANS[-1]="methane"

print("".join(ANS))