#!/usr/bin/perl

use strict;
use warnings;

use 5.010001;

my $input;
say "Please Enter String a string to be encrypted or decrypted";
$input = <>;
chomp $input;
my @ascii_char;
my $char;
while($input =~ m/(.)/g) {
	push @ascii_char, ord $1;
}

say @ascii_char;
open my $ENCRYPTED_STRING, '>', \my $encrypted_string;
foreach( @ascii_char ) {
	if ($_ >= 97 and $_ <= 122) {
		if ((122 - $_) <13 ){
			$_ = 97 + (13 - (123 - $_));
		}
		else {
			$_ += 13;
		}
	}
	elsif ($_ >= 65 and $_ <= 90) {
		if ((90 - $_) < 13 ){
			$_ = 65 + (13 - (91 - $_));
		}
		else {
			$_ += 13;
		}
	}

	print $ENCRYPTED_STRING chr;
}
close $ENCRYPTED_STRING;

say $encrypted_string;