Postorder

Score: 62.10 (pass)

#!perl -l
$_=pop;for$x(pop=~/./g){s/(\w*)$x(\w*)/$1 $2 $x/}print/\w/g

Score: 66.10 (pass)

#!perl -l
$_=pop;for$x(split'',pop){s/(\w*)$x(\w*)/$1 $2 $x/}s/ //g;print