# Cyrillic characters problem

I want to write a math paper that needs to be in Bulgarian (uses the same alphabet as Russian). However when I try to compile with pdflatex I get the following error for every cyrillic character:

! Package inputenc Error: Unicode char н (U+43D)
(inputenc)                not set up for use with LaTeX.


Here is how my .tex file looks:

\documentclass{article}

\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[russian]{babel}

\begin{document}
\chapter{Полиноми}
\section{1.1 Теорема за деление с частно и остатък на полиноми}
$F$ = поле и $f, g \in F[x], g \neq 0$\\
$\exists!$ двойка полиноми $q, r \in F[x]$, такива че\\
$f = gq + r$ и $deg r < deg g$
\end{document}


I am very new to LaTeX so sorry for the simple question, I appreciate your help.

• Sorry, but I get no error (after replacing article with book). What TeX distribution are you using? – egreg May 24 '19 at 13:09
• This is the output when I query for my version: pdfTeX 3.14159265-2.6-1.40.18 (TeX Live 2017/Debian) kpathsea version 6.2.3 Compiled with libpng 1.6.34; using libpng 1.6.34 Compiled with zlib 1.2.11; using zlib 1.2.11 Compiled with poppler version 0.62.0 – Kristiyan May 24 '19 at 13:20
• It is a bit outdated. Check in the Debian packages that TeX support for Cyrillic is installed. Can you please add the log file up to the first error? – egreg May 24 '19 at 13:25