The official language in Sofia is Bulgarian. It is based on the Bulgarian, so-called Cyrillic alphabet.
Bulgaria is the only country in the world that has its holiday of literacy, education and culture. It is celebrated every year on 24 May, when Bulgaria honours the work of the holy brotherd Cyril and Methodius who devised the alphabet.
Nowadays the Cyrillic alphabet is used not only by Bulgarians, but by Serbs, Montenegrins, Russians, Ukrainians, Belarusians, as well as by non-Slavic peoples like Mongols. A total of over 200 million people! With the accession of Bulgaria to the European Union on 1 January 2007, the Cyrillic alphabet became one of the official alphabets in the community.