Pinyin seems to be misunderstood as control sequence

Question

I need to use some Chinese characters with pinyin transcriptions in a paper. I have found the CJK package, which includes a pinyin package, and everything seemed to work well. Suddenly it stopped working, and it seems as the pinyin command \long3 is being interpreted as a control sequence \long.

Here's a working example:

\documentclass[11pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{CJK} %Chinese characters
\usepackage{pinyin}
\begin{document}

\begin{CJK*}{UTF8}{bsmi}
野草莓運動, \Ye3 \cao3\mei2 \yun4\dong4
\end{CJK*}

\end{document}

Everything works well, until I want to use a character that in pinyin is transcribed as \long3:

\documentclass[11pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{CJK} %Chinese characters
\usepackage{pinyin}
\begin{document}

\begin{CJK*}{UTF8}{bsmi}
壟 \long3
\end{CJK*}

\end{document}

The error message is:

! You can't use a prefix with `the character 3'.
[...]
I'll pretend you didn't say \long or \outer or \global or \protected.

What can I do about this?

Answer 1

As the documentation for pinyin (texdoc pinyin) says

use \Long and \LONG instead of \long and \Long (which you would expect): \long is a very important internal TeX command. Many packages would fail if we redefined \long.

Thus you need to use \Long here.