Concept:
This is an alphabet series.
We convert each letter into its alphabet position.
\[
A=1,\ B=2,\ C=3,\ldots,\ Z=26
\]
Step 1: Write positions.
\[
V=22
\]
\[
S=19
\]
\[
P=16
\]
\[
M=13
\]
Step 2: Observe the pattern.
The positions are decreasing by \(3\):
\[
22-3=19
\]
\[
19-3=16
\]
\[
16-3=13
\]
So the next position is
\[
13-3=10
\]
Step 3: Convert position \(10\) to letter.
The \(10^{th}\) letter is
\[
J
\]
Step 4: Final answer.
\[
\boxed{J}
\]