box paint by croyal

while 1:
 s=raw_input()
 r=l=''
 b=f=0
 for c in s:
    if c=='#' and l=='#':f=1
    elif not b and not f and l=='#' and c==' ':b=1
    elif (b or f) and l=='#' and c==' ':f=0;b=0
    if c=='#':r+=c
    elif b:r+='.'
    else:r+=c
    l=c
 print r

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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