perl -MO=Deparse -plwe "$h{$_}++ } for (sort {length($a) <=> length($b) } keys %h) {"

BEGIN { $^W = 1; }
BEGIN { $/ = "\n"; $\ = "\n"; }
LINE: while (defined($_ = <ARGV>)) {
    chomp $_;
    ++$h{$_};
}
foreach $_ (sort {length $a <=> length $b;} keys %h) {
    ();
}
continue {
    print $_;
}

##</code><code>##

while (<>) { your code here }
continue { print $_ }

##</code><code>##

perl -wlpe '}{*_=*.' filename