s=input()+' ';b='';l=[' '];c=m=0
for i in s:
 if i=='ｗ':c+=1
 else:
  if c>m and b:
   m=c;l=[]
  if c==m:l+=[b]
  if c:b=''
  c=0;b+=i
for i in l:print(i)