na vs. an
particles are weird.
"An" is used for singular nouns, while "na" is for those in plural form.
Here, it is just one newspaper, so you take the singular form "An".
I wrote An nauchtan with the apostrophe but was marked wrong..Why?
Make sure you use a fada, not an apostrophe, it looks like this: á. Only use it in the second 'a' within the word, so it looks like: An nuachtán. Also ensure your spelling and grammar are all correct as well.