Fill in the missing letter in the following series:
$$\text{S, V, Y, B, ?}$$

Let's examine the positions of the letters in the English alphabet:
* $\text{S}=19$
* $\text{V}=22$ (Shift of $+3$)
* $\text{Y}=25$ (Shift of $+3$)
* $\text{B}=2$ (Shift of $+3$, since $25+3=28\equiv 2(\mathrm{mod}26)$)
* Next element position $=2+3=5$, which corresponds to the letter $\text{E}$.