Similarity Expansion by twobit (no import)

s=""
while 1:a=raw_input(s).strip('" ');b=s[:s.find(" ",5)+1]*(a>"Z")+a;s=b+s[len(b):-(b[-1]>".")]+"\n"

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

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return top