<?php
      $data_array= [];
      foreach ($myposts as $post) : setup_postdata($post);
      $co = count($myposts);
      $title = get_the_title();
      $seperate_title = explode('(', $title);
      $size = rtrim($seperate_title['1'], ')');

      array_push($data_array, get_the_ID());
      echo "<pre>";
      var_dump($data_array);
      endforeach;
    ?>