Wonderful Multisets by hallvabo

import re
def f(m):c=m.group().count;return'10'[c('1')<c('0')]
while~0:s=raw_input();exec"s=re.sub('{[01]+}',f,s);"*11;print s

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

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