Wonderful Multisets by rolf

import re
R=re.sub
while 1:a=raw_input();exec'a=R("\{0+\}","0",R("\{1*\}","1",R("01|10","",a)));'*20;print a

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

To protect the system from spam, please input your favorite sport (hint: I believe its name must start with 'g', case insensitive)

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