magento get all gallery images

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
 ?>
<?php
require_once 'app/Mage.php';
Mage::app();

$copypasta = <<< EOC
<<< EOC
SKU!
SKU@
SKU#
EOC;
$skus = explode(PHP_EOL, $copypasta);

foreach ($skus as $prod) {

$product = Mage::getModel('catalog/product')->loadByAttribute('sku', $prod);

if($product && $product->load('media_gallery')) {

foreach ($product->getMediaGalleryImages() as $image)
  {
    $file_name = $image->getFile();
    echo  "URL" . $file_name;
    echo "#";
  }
}
echo "<br/>";
}

?>