\documentclass[12pt,a4paper]{article} 
\usepackage{amsmath}
\usepackage[T2A]{fontenc}
\usepackage[cp866]{inputenc}
\usepackage[russian]{babel}
\usepackage{colordvi}

\let\zzz\alpha

\DeclareSymbolFont{greek}{OT1}{gr}{m}{n}

\DeclareMathSymbol{\alpha}{\mathord}{greek}{"61}
\DeclareMathSymbol{\beta}{\mathord}{greek}{"62}
\DeclareMathSymbol{\sigma}{\mathord}{greek}{"63}
\DeclareMathSymbol{\delta}{\mathord}{greek}{"64}
\DeclareMathSymbol{\varepsilon}{\mathord}{greek}{"65}
\DeclareMathSymbol{\varphi}{\mathord}{greek}{"66}
\DeclareMathSymbol{\gamma}{\mathord}{greek}{"67}
\DeclareMathSymbol{\eta}{\mathord}{greek}{"68}
\DeclareMathSymbol{\iota}{\mathord}{greek}{"69}
\DeclareMathSymbol{\theta}{\mathord}{greek}{"6A}
\DeclareMathSymbol{\kappa}{\mathord}{greek}{"6B}
\DeclareMathSymbol{\lambda}{\mathord}{greek}{"6C}
\DeclareMathSymbol{\mu}{\mathord}{greek}{"6D}
\DeclareMathSymbol{\nu}{\mathord}{greek}{"6E}
\DeclareMathSymbol{o}{\mathord}{greek}{"6F}

\DeclareMathSymbol{\pi}{\mathord}{greek}{"70}
\DeclareMathSymbol{\chi}{\mathord}{greek}{"71}
\DeclareMathSymbol{\rho}{\mathord}{greek}{"72}
\DeclareMathSymbol{\varsigma}{\mathord}{greek}{"73}
\DeclareMathSymbol{\tau}{\mathord}{greek}{"74}
\DeclareMathSymbol{\upsilon}{\mathord}{greek}{"75}
\DeclareMathSymbol{\omega}{\mathord}{greek}{"77}
\DeclareMathSymbol{\xi}{\mathord}{greek}{"78}
\DeclareMathSymbol{\psi}{\mathord}{greek}{"79}
\DeclareMathSymbol{\zeta}{\mathord}{greek}{"7A}



\begin{document}

\begin{center}
Ё╥╔═┼╥1.\\ 
\Red{Є┴┬╧╘┴ ╙ ╨╥╤═┘═╔ ╙╘╥╧▐╬┘═╔ ╟╥┼▐┼╙╦╔═╔ ╙╔═╫╧╠┴═╔ ╫ ═┴╘┼═┴╘╔▐┼╙╦╧═ ╥┼╓╔═┼.}\\
щ╙╨╧╠╪┌╒┼╘╙╤ GREEK FONT {\bf grreg10, ╟╥┼▐┼╙╦╔╩ ╥┼╟╒╠╤╥╬┘╩} ╔┌ ╨┴╦┼╘┴ LEVY.
\end{center}

\large
$$\alpha,
\beta,
\gamma,
\delta,
\epsilon,
\varepsilon,
\varphi,
\eta,
\theta,
\iota,
\kappa,
\lambda,
\mu,
\nu,
\xi,
\pi,
\rho,
\sigma,
\tau,
\upsilon,
\chi,
\psi,
\omega,
\zeta.$$
$$\omega_\tau^\kappa$$
$$\sum_{\pi}{^\psi}$$
\end{document}
