Doubt using $wpbd->get_col for a single column

Try this. Hopefully I’ve interpreted your output correctly.

I’d recommend a good read of the $wpdb codex, particularly in relation to the get_col() method – http://codex.wordpress.org/Class_Reference/wpdb#SELECT_a_Column

global $wpdb;   // You won't need this unless this code is within a function

$query = $wpdb->prepare(
    'SELECT %1$s.guid FROM %1$s',
    $wpdb->posts
);
$results = $wpdb->get_col($query);
$counter = 1;   // Ignore this if you already set counter somewhere else, or change it as required

if(!empty($results)) : foreach($results as $result) :

        echo '<div><p>';

            printf(
                '%1$s- %2$s =>',
                $counter,
                $result
            );
            printf(
                '<input class="input_triplify_posts" value="correspondence" id="correspondence%1$s mk="%2$s" />',
                $counter,
                $result
            );

        echo '</p></div>';

        $counter++;

    endforeach;
endif;