LaTeX: How to wrap a sideways text in a column (tabular)

Question

Let's say we have a table

\begin{tabular}{|c|c|} \begin{sideways}A\end{sideways}&\begin{sideways}B\end{sideways}\\
a & b \\
\end{tabular}

How can I define the height of cells A and B, so that in case of A and B being a longer caption, the text will wrap-around the cell? Putting p{x pt} in the tabular environment's table specs doesn't seem to do the trick..

Answer 1

The following snippet creates a box that is 1/4 of an inch wide, and includes the letter a.

\begin{minipage}[t]{.25in} a. \end{minipage}

Anyway, increase the size to whatever is needed, and add better text.