I'm working with WolframAlpha and now I'm going to compare languages: Arabic, Hungarian, Russian, Belorussian (Byelorussian, Belarusan).
P.S. I'm writing not everything, only important things.
There's a table about total speakers, native speakers and places with most speakers. I won't write about it, because it's not so important.
But there's a table about original location, language codes and writing system. OK, so, for Arabic: original location - Saudi Arabia, language codes - ar, arb, writing system - Arabic alphabet. For Hungarian, original location - Hungaria, language codes - hu, hun, writing system - Latin alphabet. For Russian: original location - Russia, languages codes - ru, rus, writing system - Cyrillics. For Belorussian - original location - Belarus, language code - bel. I don't know, why isn't there written the writing system, but, if you didn't know, it's Cyrillics.
Arabic: Afro Asiatic - Semitic - Central - South - Arabic.
Hungarian: Uralic - Finno Ugric - Ugric - Hungarian
Russian: Indo European - Slavic - East Slavic - Russian
Belorussian: Indo European - Slavic - East Slavic - Belorussian
Letters, used in Russian: а б в г д е ё ж з и й к л м н о п р с т у ф х ц ч ш щ ъ ы ь э ю я
Letters, used in Hungarian: a à b c d e é f g h i í j k l m n o ó ö ő p r s t u ú ü ű v y zLetters, used in Arabic:
There's no Belorussian letters, written in WolframAlpha, but I'll write them for you: а б в г д е ё ж з i й к л м н о п р с т у ў ф х ц ч ш ы ь э ю я '. Yeah, apostrophe is also a letter in Belorussian.