memoir: change paragraph title from “10. Excercise” to “Exercise 10”

Question

I use

\setparaheadstyle{\normalsize\itshape}
\setafterparaskip{1ex}

I'd like to move the number to the right and dispense with the period. I'd also like to align the whole title to the right (to flush it right?). Is there a way to do it?

MWE as requested:

\documentclass[11pt,a4paper,oneside]{memoir}

\pagestyle{plain}

\usepackage{fontspec}
\usepackage{xltxtra}
\usepackage{polyglossia}

\setmainfont[Mapping=tex-text]{Liberation Serif}
\setsansfont[Mapping=tex-text]{Liberation Sans}
\setmonofont[Mapping=tex-text]{Liberation Mono}


%% Ensure sequential numbering of subsubsections.
\setsecnumdepth{paragraph}
\counterwithout{paragraph}{subsubsection}
\counterwithout{subsubsection}{subsection}
\renewcommand{\thechapter}{\arabic{chapter}}
\renewcommand{\thesection}{\arabic{section}}
\renewcommand{\thesubsection}{\Roman{subsection}}
\renewcommand{\thesubsubsection}{\S\arabic{subsubsection}}

\setparaheadstyle{\normalsize\itshape}
\setafterparaskip{1ex}

\setcounter{tocdepth}{3} % Must not precede the above

\begin{document}

    \chapter{Alfa}
        \section{Bravo}
            \subsection{Charlie}
                \paragraph{Exercise}
                \paragraph{Exercise}

\end{document}

Answer 1

To @Alexey Orlov and future readers, I propose a solution based only on memoir. This is a minimal working example, that does what you want:

\documentclass{memoir}
\setsecnumdepth{paragraph}
\renewcommand{\theparagraph}{Question \arabic{paragraph}}% This does the trick
\setparaheadstyle{\normalsize\itshape}
\setafterparaskip{1ex}
\pagestyle{plain}
%\headstyles{default}% This is the modified style.
\begin{document}
\paragraph{} Text for the first exercise.% Observe '{}'
\end{document}

Answer 2

This is my MWE, new and improved. The solution based on titlesec is quite satisfactory.

\documentclass[11pt,a4paper,oneside]{memoir}

\pagestyle{plain}

\usepackage[explicit]{titlesec}

\usepackage{fontspec}
\usepackage{xltxtra}
\usepackage{polyglossia}

\setmainfont[Mapping=tex-text]{Liberation Serif}
\setsansfont[Mapping=tex-text]{Liberation Sans}
\setmonofont[Mapping=tex-text]{Liberation Mono}


%% Ensure sequential numbering of subsubsections and paragraphs.
\setsecnumdepth{paragraph}
\counterwithout{paragraph}{subsubsection}
\counterwithout{subsubsection}{subsection}
\renewcommand{\thechapter}{\arabic{chapter}}
\renewcommand{\thesection}{\arabic{section}}
\renewcommand{\thesubsection}{\Roman{subsection}}
\renewcommand{\thesubsubsection}{\S\arabic{subsubsection}}
\setcounter{tocdepth}{3} % Must not precede the above

\titleformat{\paragraph}[hang]
{\raggedleft\normalfont\small\itshape\bfseries}{}{0pt}{#1 \arabic{paragraph}}


\begin{document}

    \chapter{Alfa}
        \section{Bravo}
            \subsection{Charlie}
                \paragraph{Exercise}
                \paragraph{Exercise}

\end{document}