import re
li=raw_input()
ans=[]

def Or(a):
 ans=[]
 ans+=a.split("|")
 return [ans]

def hate(a):
 ans=[""]
 if type(a)==type(""):
  ans+=a
 else:
  ans+=a
 return [ans]

def chars(a):
 return [a[i] for i in range(len(a))]

last=""
le=len(li)
i=0
c=""
hatef=0
while i<le:
 c=li[i]
 if c=='?':
  hatef=1
  ans+=hate(last) 
  last=c
  i+=1
 else:
  hatef=0
  if (last !='?')and(i>0):ans+=last
  if c=='(':
   matc=re.search('\(([^)]+)\)',li[i:]).group(1)
   i+=len(matc)+2
   last=Or(matc)
  elif c=='[':
   matc=re.search('\[([^\]]+)\]',li[i:]).group(1)
   i+=len(matc)+2
   last=[chars(matc)]
  else:
   last=c
   i+=1
if hatef==0:ans+=last 

def put(an,a,l,n):
 if l==n:
  print an
 else:
  if type(a[n])==type(""):
   an+=a[n] 
   put(an,a,l,n+1)
  else:
   for i in a[n]:
    if type(i)==type(""):
     put(an+i,a,l,n+1)
    elif type(i)==type([]):
     for j in i:put( an+j,a,l,n+1)

put("",ans,len(ans),0)