#!/usr/local/bin/perl -w

use strict;
use Getopt::Std;

use vars qw($opt_w);

getopts('w:') || die "Bad options.\n";

my $dict = $opt_w || 'wordlist';

open(DICT, $dict) or die "Can't open $dict: $!\n";

my $crypto = shift;

my $match = &crypto_canon($crypto);

while (<DICT>) {
    chomp;

    next if length $match != length $_;
    next if $match ne &crypto_canon($_);

    print "$_\n";
}

sub crypto_canon {
    my($word) = @_;

    my $canon;
    my %letters;
    my $next = 'a';

    foreach (split //, $word) {
        if ($_ !~ /[a-z]/) {
            $canon .= $_;
            next;
        } elsif (not exists $letters{$_}) {
            $letters{$_} = $next++;
        }
        $canon .= $letters{$_};
    }
    $canon;
}