HELP: Introducing Arrays

First and foremost hello to all students of treehouse, im Lans.

I have been working pretty well through the 'Build a Simple PHP Application' course so far but have now stumbled upon this problem;

I don't know if it's because I don't understand the question or what but i've watched the video a few times now and still can't get my head around it. If someone could take a look and give me some advice that would be great.

The question im stuck on in the challenge is Task 6:

"The fourth echo statement, the one inside the foreach loop, should only display one letter at a time. Change that fourth echo statement so that it does not display the static piece of text AB; instead, make it display the value for the array element under consideration inside the foreach loop."

and here is my code so far:

<?php

$letters = array("D", "G", "L");

echo "My favorite ";
echo count($letters);
echo " letters are these: \n";
foreach($letters as $letter) {
    echo $letter. "\n";

}
echo "AB"
echo ".";

?>

Like I said, I have tried a lot with it and I am just looking to learn were I have gone wrong.

Thanks for reading :D