First Derangement by rotary-o

#!ruby -pa
s,_=$F
gsub(/./){s[c=[?I,?J].find{|c|!s[($_+s).count(c)]&&c>$&}||s.tr($&,'')[0]]=''
c}

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

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