The following worked for me.

# Returns a string with the letters in s in alphabetical order.
#
procedure alpha( s )
   local result, c

   result := ""

   cset( s ) ? while c := move(1) do 
      s ? while tab( find ( c ) ) do result ||:= move( 1 )

   return result;

end

procedure main()
   while write( alpha( read() ) )
end



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