Postorder

Score: 88.29 (fail)

#!perl -l
s//@ARGV/;$=+=26*s/^(.)(.{$=})(.*) (.{$=})\1(.*)/$2 $4
$3 $5
$1/mwhile$=--;print/\w/g

Score: 88.29 (pass)

#!perl -l
s//@ARGV/;$=+=26*s/^(.)(.{$=})(.*) (.{$=})\1(.*)/$2 $4
$3 $5
$1/mwhile$=--;print/\w/g