How to add numeric pager in Wordpress

Hello, I would like your help to solve the following problem that I am having, the code below below filters Wordpress items by letter, however I am not able to integrate the paging function into this script, I would like your help to be able to improve the script so that it stays with numeric pagination and paging arrows.

<?php
$posts_per_row = -1;
$posts_per_page = -1;
$curr_letter = $_GET["letra"];
?>

<div>

  <div class="alphanav">
     <a href="<?php bloginfo('url'); ?>/lista/?letra=A">A</a>
     <a href="<?php bloginfo('url'); ?>/lista/?letra=B">B</a>
     <a href="<?php bloginfo('url'); ?>/lista/?letra=C">C</a>
  </div>

  <div>

     <div id="a-z">

       <?php

       $paged = (get_query_var('paged')) ? get_query_var('paged') : +1;
       $args = array (
         'posts_per_page' => $posts_per_page,
         'post_type' => 'blog',
         'orderby' => 'title',
         'order' => 'ASC',
       );

       query_posts($args);

       if ( have_posts() ) {
         while ( have_posts() ) {
           the_post();
           If ($curr_letter == true) { $first_letter = strtoupper(substr(apply_filters('the_title',$post->post_title),0,1));
           if ($first_letter == $curr_letter) {  ?>
              <div class="title-cell"><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title_attribute(); ?>"><?php the_title(); ?></a></div>
           <?php } else { ?>



    <?     } ?>
         <?php } else { ?><div class="title-cell"><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title_attribute(); ?>"><?php the_title(); ?></a></div> <?} } ?>
       <?php } else {
        echo "<h2>Desculpe o conteudo não existe</h2>";
       }


       ?>

     </div><!-- End id='a-z' -->

   </div>

 </div>