The Cyrillic Script
The brothers and orthodox Slavonic monks Cyrill and Methodius invented the Glagolitic
script in Macedonia in the year 863 as an encrypted Greek alphabet with extensions
for special Slavic sounds. Their scholar Clement of Ohrid invented the "Cyrillic"
script later as a more readable transformed Glagolitic alphabet. Over the course
of the centuries the Cyrillic script was spread and transformed and it was modernized
into its current Romanized shape (Grazhdanka) under Tsar Peter the Great.
Nowadays the Cyrillic script is used by more than 70 languages ranging from
Eastern Europe's Slavic languages Russian (ru), Ukrainian (uk), Belarussian
(be), Bulgarian (bg), Serbian (sr), and Macedonian (mk) over Central Asia's
Altaic languages like Azerbaijani (az), Turkmen (tk), Kurdish (ku), Uzbek (uz),
Kazakh (kk), Kirghiz (ky) to others such as Tajik (tg) and Mongolian (mn). Your
library may have the booklet "Alfavity jazykov narodov SSSR" by Kenesbai
Musaevich Musaev that was published in 1965.
With a small accent-free alphabet, Russian and Bulgarian seemed equally well-suited
for computer processing as English.