for(;s=readline();)for(i in s){for(d=b=k=v="";c=s[k++];b=c)d-=b<")"?c==b&&-1:c>=b,v+=d-i?" ":c;1>v||print(v.replace(/ +$/,""))}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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