I want to know the answer to the following question:
How many extra letters does the Croatian Latin alphabet have?
All the background I'm provided with is that "The Croatian Latin alphabet (Gajica) followed suit shortly afterwards, when Ljudevit Gaj defined it as standard Latin with five extra letters that had diacritics, apparently borrowing much from Czech, but also from Polish, and inventing the unique digraphs "lj", "nj" and "dž".". Is that enough to answer the question?
Answer: yes