\begin{Verbatim}[commandchars=\\\{\}]
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n+nb}{print}\PYG{p}{(}\PYG{n}{my\PYGZus{}seq}\PYG{p}{[}\PYG{l+m+mi}{0}\PYG{p}{])} \PYG{c+c1}{\PYGZsh{}first letter}
\PYG{g+go}{G}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n+nb}{print}\PYG{p}{(}\PYG{n}{my\PYGZus{}seq}\PYG{p}{[}\PYG{l+m+mi}{2}\PYG{p}{])} \PYG{c+c1}{\PYGZsh{}third letter}
\PYG{g+go}{T}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n+nb}{print}\PYG{p}{(}\PYG{n}{my\PYGZus{}seq}\PYG{p}{[}\PYG{o}{\PYGZhy{}}\PYG{l+m+mi}{1}\PYG{p}{])} \PYG{c+c1}{\PYGZsh{}last letter}
\PYG{g+go}{G}
\end{Verbatim}
