Refer to the given letter and symbol series and answer the question that follows. Counting to be done from left to right only.
$\text{(Left) } \% \text{ J } \$ \text{ K } \text{Y} \textcopyright$ £ £$ \text{ X } \text{ N } \text{ A } \$ \text{ C } \& \% \text{ B } \textcopyright \text{ B } \text{ O }$ € $\text{ D } \text{ P } \text{(Right)}$
How many such letters are there, each of which is immediately preceded by a symbol and also immediately followed by a symbol?
- $4$
- $3$
- $5$
- $2$
